ProSizer Penis Extender System
How the ProSizer™ Works

The ProSizer™ is a small device worn over the penis to increase size.

Specifically, the ProSizer™ extender uses traction to apply consistent outward pressure to the penis. Over a short period of time, the penis increases in size as a direct result of this traction.

In essence, there's nothing to do except put it on, adjust the tension and forget about it. Wear it whenever you want - sleeping, working or just sitting around the house. The extender does all the work for you.

The ProSizer™ is easy to use, comfortable, painless and can even be worn discretely under loose-fitting trousers!

The Physiology Behind the ProSizer™

The principle behind our device is simple.

It's no secret that the human body has an innate natural ability to adapt under physical influence. When particular parts of the body are exposed to gentle but constant pressure (also know as "traction"), the cell tissue in the targeted area begins to divide and multiply, thus creating new tissue.

The end result is an increase in size of the targeted area.

In fact, you may already be somewhat familiar with the principles of traction...

Consider these widely-known (yet extreme) examples:

  The use of neck rings by women in some indigenous cultures to elongate the neck. In their society, a long neck is considered a sign of beauty.

Or how about the use of lip disks and ear disks by tribal natives and indians. By using disks of increasing size over time, they are able to expand these body parts to almost unbelievable size.

Many native people have used traction to increase the size of the penis as well. The Sadhus holy men of India, Peruvian Cholomecs, and Papua Indians of New Guinea are all examples. Men in these groups ritually employ penis traction techniques, attaining lengths up to 22 inches.

How to Use the ProSizer™

If not assembled, assemble ProSizer™ as shown in image below.


The ProSizer™ consists of a molded plastic base attached to (2) adjacent threaded extension posts with adjustment knobs. Extension rods attach to the extension posts. A plastic support rests on top of the extension rods, and a silicone hose is threaded through the support. For added comfort, a foam comfort sleeve can also be worn around the penis.

  • Thread silicone hose through support, allowing loop to form on the bowl-shaped side of the support.

  • The support is NOT intended to fit tightly onto the extension rods. The support is supposed to be very loose. The support will be held onto the rods by a combination of pressure from traction and gentle resistance from the loop-secured penis.


The device is used by placing the base over the penis, so that the extension rods are parallel with the penis shaft (one on each side).

The head of the penis rests in the bowl-shaped support.

By passing the two ends of the silicone hose through the holes in the support, a loop is made through which the head of the penis is introduced. Before tightening the loop around the head of the penis, the support should be fully pressed onto the extension rods. Once again, the support is not supposed to fit tightly on the extension rods.

The loop is secured around the head of the penis by pulling the ends of the hose on the reverse side of the support. The hose is fitted just below the glans (head) of the penis.

To prevent loosening, the ends of the hose may be either tied in a knot or pressed into the two notches on the back of the support.

In rare cases, initial soreness can be experienced from using the device. Such soreness is usually caused by excessive traction. To prevent soreness, never exceed your comfort level.

To relieve any soreness around the head of the penis caused by the silicone hose, you may wish to purchase a foam comfort sleeve (sold separately) which acts as a cushion between the hose and the skin (see image below).

Demonstration Instructions:

Demonstration Images


Once the device has been applied to the penis, you may manually adjust the amount of tension (traction) applied to the penis using the adjustment screw knobs on the extension posts.

For best results, we recommend that you maintain equal tension on each rod. The best way for you to verify this is to measure the distance or count the number of threads on each extension rod. For instance, if 7 screw threads are showing on the left extension rod, then adjust the right screw knob until 7 screw threads are showing on the right extension rod. This will ensure that equal traction is applied to both sides.

Unlike other extenders, our extension rods DO NOT use spring-loaded mechanisms, which means you have 100% control over the amount of tension you apply.

Using the adjustment screw knobs, apply just enough tension so that you feel a gentle stretch of the penis, but that it causes no discomfort whatsoever.

CAUTION: NEVER adjust the device beyond your comfort level.

Every few days or as desired, turn each adjustment screw knob approximately one revolution outward, which will add just a little bit more tension to the penis. Repeat as needed.


For the first 2 weeks, the device should not be worn for more than 4 hours per day, and only mild tension should be applied.

Thereafter, the device may be worn up to 12 hours per day, and mild or moderate tension may be applied.

While using the device, the penis can be held at any position except sideways. The device may be worn during the day and will remain inconspicuous in loose-fitting trousers. The device may also be worn at night while sleeping. The hose may become detached from the penis during restless sleep. If this occurs, simply re-attach as needed.

For best results, the ProSizer™ device should be worn approximately 10 hours per day for a period of no less than 5 months. Take InVigorex penis enlargement pills and EjacuMax volume enhancement pills daily for optimal results.


The device can be easily removed by loosening the silicone hose and removing the penis from the loop. The device can then be removed from around the base of the penis.

When not in use, the device can be left assembled. To make re-application easier, do not move the adjustment screw knobs. Tip: You may wish to mark the threaded rod with a marker to indicate the position of the screw knobs.

Care and Maintenance:

The device should be handled carefully. Avoid bending the extension rods, tearing the silcone hose or breaking the support or base. Replacement components may be available.

The plastic base and support may be cleaned at your discretion with mild soap and water. Keep water away from brass metal components. Do not place device in dishwasher. A chlorhexidine alcohol solution of 0.5% may be used for disinfection.



These statements have not been evaluated by the Food and Drug Administration. Results may vary. This product is not intended to diagnose, treat, cure or prevent any disease or medical condition. Austin Research Institute, Inc. will not be held responsible or liable for any injuries or medical conditions which may arise as a result of the use or misuse of this product. This product is sold as a novelty only and is not intended for medical use. Consult a physician prior to use of this product. Use as directed by your physician.

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