By Dr. Jeff Ferrara
Medically Reviewed by Dr. Jesse Martinez

Author portrait of Dr. Jeff Ferrara, MD

Updated on November 2, 2018

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

So you've properly mesaured your penis, but are looking to gain some penis length, right?

Well, you're in the right place.

Let's get started.

Examples of Popular Penis Extenders



parts of the PhalloGauge Extender

Click here to learn more about the PhalloGauge Extender™

Best Penis Extender Prices

The best penis extenders typically cost between $150 and $300.

That's a lot of money, so you have to consider your budget.

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

Brand Reg. Price
PhalloGauge $115
SizeGenetics $250
X4 Labs $200
Phallosan $339
PeniMaster Pro $325
SizeDoctor $350
Jes Extender $200

The table shows the base price of each extender.

PhalloGauge is the clear winner in price by a landslide.

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

PhalloSan is the most expensive extender - last place for price.

As you can see, it costs more than $300.

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

Frequently Asked Questions (FAQ)

Can I wear one under my pants?

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

Are enlargement devices 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, penis extenders 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 an extender device, 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 an extender in bed?

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

Can penis extenders add girth gains?

Answer: No. The industry standard for girth gains is to use a penis pump.

Will using an 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 product?

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

What is a Penis Extender?

Penis extenders are medical devices that hold the penis in a stretched state for long periods of time to increase length permanently.

They are certified for self-use and do not require a doctor's prescription.

They are are also known as penile extenders, traction devices and penis stretchers.

They should not be confused with the sex toy, penis extensions.

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

How do Penis Extenders work?

They utilize a technique known as "penis traction".

Penis traction is when the penis is held in a stretched state for an extended period of time.

Penis traction is the scientific reason why extenders add length.

Penis Extender Results

The commonly accepted result is:

0.7 inches gained (length) in 12 weeks.

--British Journal of Urology International (BJUI)

Well even the renowned WebMD acknowledges that 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 penile length increases are 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 reusults from clinical studies in an easy-to-read summary.

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

Why Should You Use a Penis Extender?

A few reasons:

  1. No need to do penis stretching exercises anymore.

  2. It's efficient. Use it to multitask.

  3. Specifically target length gains.

You should think of them as tools that make penis training more productive and efficient.

What is the Best Penis Extender?


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.

Best penis extender thumbnail

Extender Guide Video by James Federico, Chief Length Consulting Officer for PhalloGauge.

Other Penis Stretcher Devices

Penis Extender #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.

Penis 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.

Penis Extender #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

You can learn how to use these penis extenders here.

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 Extender's 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 large advantage of pulling 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 extender style is pretty straightforward.

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 the best 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).

Penis Extenders for 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 can cause serious self-esteem issues.

Not to mention, it makes sexual intercourse more difficult.

It has been clinically proven that extender devices are effective treatments for Peyronie's Disease.

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.

All forms of physical training mandate that any sharp pain requires you to stop.

Likewise, in all other forms of penis enlargement training, if you feel fatigue, then it means you're 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.

That's your body's alarm system going off.

In Conclusion

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

However, they aren't used to increase girth.

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.

More Resources

Check our our in-depth reviews on the most popular extenders on the market.

Or check out our PhalloGauge Extender, which was designed for your user experience (results, comfort, stealth).

PhalloGauge Brand Logo and motto.

"Hey man, I got you free shipping on the PhalloGauge Extender - on the house."
Kind regards, Dr. Ferrara

Maybe later

The PhalloGauge Team will answer all questions / comments you may have.

Feel free to leave a comment as an anonymous guest!

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"Hey man, I got you free shipping on the PhalloGauge Extender - on the house."
Kind regards, Dr. Ferrara

Maybe later