Proper sizing of the BullMaster is important!

The BMC Cylinder size you order should be based on TWO primary dimensions and your personal preferences. These dimensions are the way the length of the penis pocket, and the length to the center of the testicle or ball pocket contours. The objects are to keep the penis contour equal to your length or longer, while getting the cylinder short enough that your testicles center in the ball contour pockets.

All Bulls are made initially at 9" length, and are designed to have the entry section shortened to fit the user. This adjusted length can be anything between 7" at minimum and 9" at maximum. On special request we can shorten this to 6.5", but this choice is not offered online. These dimensions do not include the length added by the seal space.

• The dimensions shown in the drawing below are from the Hard Rim of the cylinder.
• The seal will add approximately 1/2" to 3/4" in additional space between the Hard Rim and your body.
• The size of the opening will allow the cylinder to seat at approximately 1" behind the base of the penis (pubic bone point) as it would be measured normally.

The result of this is that the hard rim of the cylinder (which is the point we calculate from when cutting to fit) will be perhaps 1/2" behind your penis base when pumping. Thus if you have a 6" erect penis, the distance from the hard rim to the end of the penis when pumping would be about 6-1/2". This is an average- the dimension varies with the individual build of the pumper, because the cylinder will seat higher on a thin person and lower on a heavier one.

HOW PENIS SIZE SHOULD BE USED:
The penis pocket can be longer or slightly shorter (up to 3/4") than the above dimension. Usually, the recommendation for sizing based on penis length is to order 1" more than your normal erect length- a 6" user would order a 7" cylinder. If the testicle fitting works well at that length, it would be the right choice. If you wish to be more liberal, the size could be 1-1/2" more, or a 7-1/2" cylinder for the same user.

HOW TESTICLE LENGTH SHOULD BE USED:
Ideally, the testicles would be centered in the testicle contours in the maximum pumped state, or slightly short of that point to encourage stretch. If your testicles don't reach the pockets, the cylinder will not be able to work properly. Thus, testicle dimension is more important than penis pocket dimensions. However, it's much harder to measure your testicle hang than your penis length.

The ideal way to measure this is to use another tube, and measure the length during a pumping session. This should be a tube you can fill up so that there will be good lengthwise tension on the testicles. When pumped, simply measure the length from a reference point you can transfer to the Bull. This could be from the top of the cylinder, or a body point. For instance if your testicles center is 1" short of the end of the penis when in the pump, you can estimate your testicle centers hang 1" less than your penis length. Compare this to the diagrams below; if your testicles centered at 4-1/2", you would want the hard rim of the cylinder reduced to provide that length- or cut down from 6-1/4 to 4-1/2", resulting in a order size of 7-1/4".

BALANCING THE DIFFERENCE:
The testicle fit is the most important of the two. We recommend that this be 70% of the sizing consideration.