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By Dr. Jeff Ferrara

Updated on August 9, 2018

A penis extender on display.

Hi guys, my name is Dr. Jeff Ferrara and I'm going to teach you about penis extenders.

So you're looking to gain some penis length, right?

Well, you're in the right place.

In this guide, you're going to learn which one is the best.

If you want to learn how to use a penis extender, go here.

Let's get started.

What is a Penis Extender?

Penis extenders (not to be confused with the sex toy, penis extensions), are also known as penile traction devices and penis stretchers.

Comparing what a penis extender looks like to a penis extension.
Here, we talk about penis extenders, medical devices used to increase length permanently, not penis extension sex toys.

They are simple machines that were invented to hold the penis in a stretched state to achieve penis length gains.

This is called "penis traction"

Penis traction is the fundamental reason why extenders add length.

You can learn more about the science of penis traction and how penis extenders work, here.

Penis Extender Results

Well even the renowned WebMD acknowledges that penis extenders work:

"You might have to wear a weight (or extender) strapped to your penis eight hours a day for six months," says O'Leary. At the end of it, you could be lucky enough to gain about half an inch." --WebMD

typical example of a penis extender device
(Even WebMD recognizes that it's possible.)

But it's not just WebMD that recognizes that extenders simply work.

Extender effectiveness has also been reported in Time Magazine, medical journals (British Journal Urology International [BJUI]), and in research labs across the world.

In fact, we've compiled all the studies done on penis extender results, here, in an easy-to-read summary.

bar graph showing the average length gained from penis extenders over time.
Here is the result from Sina University, at Tehran Medical

Quick Penis Extender Reviews

Penis extenders typically cost between $150 and $300.

That's a lot of money.

Here are the most well-known extenders and their prices:

Brand Reg. Price Rating (Out of 5)
$115 5
SizeGenetics $250 4
X4 Labs $200 4
Phallosan $339 5
PeniMaster Pro $325 3
SizeDoctor $350 3
Jes Extender $200 2

The table shows the base price of each extender.

Usually, the vendor offers different packages / accessories that you can buy with these extenders, so the price varies and might actually be a bit higher than expected.

Unfortunately, penis stretchers are pretty expensive.

They typically cost you more than $150.

Some even go as high as $339!

Showing the price tag of the PhalloSan penis extender.
At $339 (not including shipping) the PhalloSan is one of the most expensive extenders are the market.

Ultimately, it doesn't matter which device you use.


Because all that matters is:

Penis Extender Requirements

  • It doesn't slip off.

  • It's comfortable.

  • It's hidden (People can't see it bulging through your pants).

Most extenders on the market can do these 3 things, no problem.

However, now the price is the biggest issue.

That's why some guys try to make their own extender.

In fact, we literally teach you how to make your own homemade penis extender, in this tutorial.

In-Depth Penis Extender Reviews

Or, if you want to learn more about the extenders above, check out our in-depth reviews:

Penis Extender Price Comparison

Bar graph comparing the prices of all the penis extenders on the market.
Penis Extender Costs Compared. PhalloGauge wins in a landslide.

What is the Best Penis Extender?


1. PhalloGauge

The Model S penis extender glamor shot
The PhalloGauge Penis Extender (Pulling Extender)

Are we biased?

Maybe a little.

However consider this:

PhalloGauge was ONLY invented BECAUSE we were not happy with the other extenders out there.

The Model S Extender Traction system that we sell here at PHALLOGAUGE is one that has addressed users' issues with all the rod-based systems.

Rod-style systems are were a good first attempt.

While they do have some non-zero value, there were definitely improvements that we made to it to guarantee that you can achieve success.

Some of these points are as follows:

The extender device needs to be completely invisible so that it can be used in public.

This is absolutely necessary because given the requirement that the product needs to be worn for long periods of time (ideally 6 hours a day), the product usage should revolve around your life not the other way around.

Another issue is the fact that so many parts are used and the rod-based system is really complicated.

This is because the Model S consists of only two main parts of that take less than 30 seconds to put on and take off combined.

Another problem with extenders is that they are notorious for slipping off, especially at the worst times.

The Model S address this issue by using a flexible, stretchy silicone polymer wrap that completely melds and grips the base of your penis glans for a fantastic grip without squeezing the hell out of your penis.

To see more reasons on how the Model S device has improved upon the status quo check out this page here.

PhalloGauge Price

At $115, there's no denying that the price of PhalloGauge in the best in literally the whole world.

Nobody can argue that.

So why do we sell it for under $100 when we could easily sell it just under $200 and still beat the other extender prices?

Because we can.

Honestly, we would feel a little guilty if we charged over $100.

Our core belief is that extenders should be available for any man - if he so desires it.

Rich or poor, every man has a right to re-take his masculinity.

Other Penis Stretcher Devices

2. PhalloSan Forte

PhalloSan is similar to PhalloGauge.

Both apply a pulling stretch on the penis.

However, Phallosan uses a vacuum condom to hold the penis glans in place.

PhalloSan Issues

Some users have reported irritation and at the tip of the glans due to the vacuum.

The vacuum is a neat idea, however, some guys are just too sensitive and can't handle it.

Here we cut open the pieces of the Phallosan for analysis.
Here, we cut open the parts of the PhalloSan to see what it is made of.

Vacuum Condom Sizes

It comes if 3 different condom sizes - small, medium, and large.

Ideally, you find the correct size and use it forever.

For example, I chose a "medium".


Because "small" was way too tight on my penis and it was painful.

One problem I soon found, is that you might actually fit between sizes.

For example, I fit between a small and a medium vacuum condom size.

As a result, the extender kept slipping off.

Hopefully you're luckier than I am and you'll fit perfectly into one of the condom sizes.

PhalloSan Price


Phallosan is well over $300.

And that doesn't even include shipping costs (which are also high because they ship from Switzerland.

Given the issues I ran into (and that you might also have), it is hard to truly recommend this extender.

3. SizeGenetics

SizeGenetics is actually not that bad.

In fact, it's probably the best one out of the old-fashioned extenders.

One thing we will say is that the noose system is probably the most comfortable out of the rod extenders.

The $200+ price point is a bit tough though.

Parts and Material Quality

SizeGenetics is made out of a quality steel for the rods.

The white plasic parts that make up the frame of the extender are decent.

The springs are also good quality.

Like all springs, they will eventually wear out so a replacement may be reuiqred.

4. X4 Labs

X4 Labs is also not bad.

However, it's hard to say if it's better than the SizeGenetics because they are so simliar.

X4 Labs has a lot more accessories (for additional price, of course).

X4 Labs has lots of sales, but even then, it's still not cheaper than PhalloGauge.


X4 Labs is famous for all the accessories that they offer.

These come with at an extra cost, however.

The offer multiple cushions and spare parts.

They even offer different noose systems that hold the top of the penis shaft.

Most guys, will find the amount of accessories a bit too much, and will just choose the basic option.

Penis Extender Types

There are two types of extenders:

  1. Pulling Extenders

  2. Rod Extenders

PhalloGauge and PhalloSan are pulling extenders.

Pulling Extenders

Pulling extenders use the instinctual nature of pulling to stretch the penis.

Typically, there is a part that grips the top of the penis shaft, and a belt that comes around that anchors to the base of the penis.

demonstrating the first step in putting on a penis extender
The PhalloGauge foam loop put on the shaft.

Demonstrating how a pulling extender works on a finger.

Why would you want to use a pulling extender instead?

A big advantage of pulling penis extenders is that they can be worn underneath any kind of pants without being detected.

Rod-based extenders hold the penis straight out which looks like you have an erection in public.

typical example of a pulling penis extender being used on a person
How pulling penis extenders are worn.

Rod Extenders

This extenders style is pretty obvious.

There are two metal rods that run along the sides that extend the penis.

Longer rods and springs are installed when you want to change the amount of force applied to your penis.

To put it on, you:

  • Set the desired stretching force by choosing the correct rod and spring length.

  • Place your flaccid penis inside the device.

  • Clamp your penis down at the glans with the noose.

  • Put your underwear and pants on over the device.

typical example of a penis extender device
A typical example of a rod penis extender.

SizeGenetics and X4 Labs are rod extenders.

Penis Extender Quality

Extender quality is important.

That's because you have to wear it for about 16 weeks to see size gains.

So you don't want an extender that craps out after week 2.

Here's what matters for quality:

Important Quality Factors

  • Number of Parts: You want less parts - less complicated.

  • Small Parts: You don't want small parts (might get lost).

  • Material: You want medical grade materials that are safe to touch.

All extenders should be using medical grade silicone rubber for their soft parts.

Medical grade silicone rubber used as a penis extender part.
Only medical grade silicone rubbers should be used.

This includes the noose part on rod-extenders, and the wrap part for the pulling extenders.

Any metal parts need to be stainless steel (no rust).

A stainless steel rod used as a penis extender part.
Stainless steel rods should always be used.

Price is not necessarily reflected on quality.

We've found that a high price usually means that they company is trying to make more profit off you.

How do we know that?

Becauase all the part materials are the same!

Penis Extender Shipping Options

Does the extender you want ship to the country that you live in?

This is an important question because this affects shipping costs.

Country that Each Company Ships From

  • PhalloGauge: USA

  • PhalloSan: Switzerland

  • SizeGenetics: United Kingdom

Shipping Costs for Different Penis Extender Brands

  • PhalloGauge: $5.96

  • PhalloSan: $10+

  • SizeGenetics: $10+

Shipping Speeds

Each extender typically takes between 3-5 days to arrive.

This is fairly standard, and almost as good as Amazon services.

  • PhalloGauge: USPS First Class

  • PhalloSan: UPS

  • SizeGenetics: UPS

Is Shipping Discreet?


This is typically the case for all the extender companies.

They all know that you don't want your family, friends, or roommates to know you are buying a penis enlargement device.

That means that the penis enlargement company is not written on the package, but rather their parent company.

As a result, you can expect your shipment to look perfectly ordinary.

The package that the PhalloGauge Extender comes in.
PhalloGauge ships using their parent company: Vanilla Soul Apps - which is written on the label instead of "PhalloGauge".

Nearly all of these companies only ship on a business day (Mon - Fri).

Buyer Frequently Asked Questions (FAQ)

Can I wear them under my pants?

Answer: Depends on which extender you buy. Some are better at this than other.

Are extenders safe?

Answer: Yes. When used correctly.

How long do I have to use it each day?

Answer: You should use it for 6 hours each day.

Are extender results permanent?

Answer: Yes, they will last forever.

How long until I see results?

Answer: Most users report that it only takes a couple weeks to start seeing results.

How long should I wear an extender each day?

Answer: We recommend between 3-6 hours total, each day.

Will both flaccid and erect length increase?

Answer: Yes, both will increase.

If I stop using a penis extender, will I lose my gains?

Answer: No. The extender device increases the total number of penile cells so that added mass will stay permanently.

Can I wear a penis extender in bed?

Answer: Yes, if it doesn't disturb your sleep.

Can penis extenders add girth gains?

Answer: Yes, to a small extent. The expansive nature of the extender also stretches the penis outward.

Will using a penis extender give me weaker erections?

Answer: No, in fact, most users report harder, fuller erections.

How old do I have to be to use a penis extender?

Answer: You must be at least over 18 years of age.

Using a Penis Extender to Treat Peyronie's Disease

Peyronie's disease is when your penis curves when erect and is not straight.

While the disease is not life-threatening, it is the source of self-esteem issues as well as possibly increasing sexual intercourse difficulty.

It hss been clinically proven that penis extenders are effective treatments to treat the curvature due to Peyronie's Disease.

Generally, the time frame to see a reduction in curvature is on the order of 6 months to a year.

A censored image of a man with Peyronie's Disease.
Peyronie's Disease is very difficult to deal with. Fortunately, extenders are effective treatments to straighten the curvature.

Penis Extender Safety Guide

a Doctor giving his safety approval

Why is safety important?

Your penis is more precious than you think.

You urinate, on average, at least twice a day. You also use it to reproduce.

Just think how hard life would be if you couldn't do any of these things.

Also, your self-esteem wouuld crumble if your penis didn't work properly.

That's why this guide is absolutely essential that your read, not only to maximize gains, but also to ensure correct penile health for your whole life.

The Risks of Using a Penis Extender

Penis Extender Safety

Any risks that exist are solely based on the user (you).

This is a very different situation compared to other medical treatments.

The doctor isn't giving you a treatment, you're using the extender yourself!

On the surface, this may seem like a bad thing, but I view it as a very good thing.

That's because, as the saying goes: "If you want something done, you have to do it yourself!".

That's not to say doctor's can't do a good job with any surgical procedures, but like we've covered before, penis extender surgery success rates are extremely low and the danger risks are extremely high.

The Easy to Follow, Dont's of Using a Penis Extender

Do not stretch for more than 8 hours a day.

an exhaustsed man who has stretched for too long during the day
Just don't stretch for more than 8 hours a day - easy rule to follow.

A common thought that most men do is think that "if I stretch more, then I will gain more."

This couldn't be farther from the truth.

However, after a certain point (at around 6 hours per day), there are no gains that can be achieved if you were to stretch more than this point.


Stretching is not the only thing that actually contributes to the actual growth of the penis. It's what triggers the growth to happen.

What actually grows the penis is when more penis cell tissue actually starts to appear due to cell hyperplasia.

Now, if you stretch say for the majority of the day (greater than 8 hours), you're not giving your body time to actually build back the tissue through hyperplasia.

In other words, you're not letting the tissue doesn't build itself up bigger and stronger than before.

In a sense, this is the same as muscle bodybuilding.

Only proper nutrition and adequate rest after a workout is what allows you to grow bigger.

This is a fundamental principle of natural penile enlargement.

Do not stretch too hard to cause sharp pain.

a man experiencing sharp pain from using a penis extender incorrectly.
Sharp pain is a clear signal that you're using a penis extender wrong.

Pain is your body's natural alarm system that tells you that something is wrong.

So don't ignore it.

Even in bodybuilding, and weight training, while there is discomfort during the actual training, there is actually no "real" pain that the body is experiencing. Rather the discomfort (and if you want to call it pain) is temporary and will eventually go away.

Likewise in penis enlargement training, if the pain is temporary then it's good pain that is contributing to your training.

However, if it is sharp pain that clearly feels wrong and makes you want to stop, almost like tortorous pain, then definitely stop.

Something is wrong here and that's your body's alarm system going off.

We highly don't recommend using an extender while you sleep.

Using one while you sleep, can be a great way to multitask to help get gains, but I advise against doing it.


The main reason against using a penis etender while sleeping doesn't really have to do with the safety of your penis - but rather the general health of your entire body:

Your sleep quality.

That's right, sleep is something that is commonly overlooked.

The point is, extenders can create a sense of discomfort while sleeping, which lowers the quality of your sleep and even the ability for you to fall asleep.

As a result, most guys will find that they will be extremely tired in the morning.

That's why we highly don't recommend wearing the extender while sleeping if it does affect your sleep, even to a small degree.

a man with insomnia from wearing a penis extender while sleeping.
We don't recommend sacrificing sleep quality to wear a penis extender at night.

Probably the only exception is if you're a heavy sleeper and won't be disturbed by it.

So try it once and see if you can even fall asleep while wearing it. If not, don't do it, just stretch and multitask during the day.

Day stretching is more than enough.

After all, the PhalloGauge extender was made to be used during your active daytime and in public without being detected and interfering with your life at all.

Things to Keep an Eye Out For

Make sure you keep an eye on these things to practice good penis extender safety.

Maximize Blood Flow

Make sure you're getting a decent blood flow to your penis.

In other words, don't choke out your penis with whatever securing mechanism is used to hold the penis in place.

This can be a noose, or the silicone wrap in the case of the PhalloGauge penis extender.

A decent blood flow ensures that your body is supporting your penile growth by delivering the proper oxygen and nutrition needed for growth.

Not only will cutting off your blood flow due to choking your penis cause pain, it will also prevent you from achieving your maximum potential for growth, especially if you're overstretching (too many hours during the day).

Is your device getting dirty? Clean it!

Good hygiene is the foundation for good health. That includes the cleanliness of your penis extender.

Remember, you're going to be wearing the device for hours each day. Over this time, it's going to accumulate dead skin cells, dust, and other unwanted particles.

Thus, remove it periodically, say at least once every two weeks, by washing it with water and basic hand soap.

demonstrating the cleaning of the PhalloGauge penis extender
Cleaning an extender is just as easy as washing your hands.

Your body will thank you for it by not getting you sick and not getting your pubic area irritated from germs or dust.

Not only will it promote good overall health, but it will also make it more comfortable to wear. And we know that comfort essentially equals results.

Things you should do that promote safety and faster gains.

Limit the tension in your stretch.

A good rule of thumb to always remember is: "Less is more".

Pull your penis just enough so that it's slightly tighter than what it takes to extend your flaccid penis it's full length.

A diagram showing different levels of tension when you wear your penis extender.
Stretching just a little more than your full extended length is the ideal tension to use.

It may seem counter-intuitive, but there's actually a very good reason.

Guys will pull too hard and "harden" their tunica which actually stunts and limits growth over the long-term.

Have a plan: A daily stetching schedule.

This is probably the single biggest thing you can do to stay consistent and guarantee yourself results.

Take into consideration what your lifestyle and schedule is like.

Here's what I did, and it worked perfectly for me.

I used to wake up and put it on after I brushed my teeth and used the bathroom. That was around 8am every day.

I would wear the device for 4 hours and take a 30 minute break during lunchtime at 12pm.

Then I would slip into the bathroom to put it back on and stretch for another 4 hours until 4pm.

After that I would take it off and be done with it for the day. Then I just went home and relaxed! I was literally getting paid (from my job at the time) to wear it while I worked! The fact that the Model S penis extender was 100% invisible allowed me to do this.

Not only does this keep you on track for results, but it also prevents you from stretching too long during the day (more than 8 hours). You also don't have to keep track of the time while wearing the stretch because you have automatic checkpoints of the start and end time that are easily applied to your daily routine.

a chart schedule outlining a weekly penis extender routine to follow
Keep a solid penis extender routine!

In Conclusion

Penis extenders are the perfect tools that will guarantee your penis lengthening success.

They aid you in your penis training by allowing you to stretch for longer without affecting your day-to-day lifestyle.

They have been clinically proven to work and because all men are the same, there's no reason why it shouldn't work for you as well.

We covered the different types of extender systems (pulling and rod-based) how to use them.

We also reviewed the most famous extenders and what to expect when wearing them.

You're well on your way to getting a larger penis in no time, just as tens of thousands of guys have done before you.

To check out the PhalloGauge Model S extender, which was designed for your user experience (results, comfort, stealth), you can learn more about it here.

PhalloGauge Brand Logo and motto.

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