Sizing
What is more important than the glans fitting inside of the bell is:
The foreskin needs to make its way out around the bell and up the side.
Inflation will push the glans out of the bell.
Weights will pull the glans out of the bell.
Take a 1 inch wide piece of paper and mark from one end 80mm (small) and 92mm (regular).
Curl the paper together so that it lines up with the markings.
This is the inside circumference of the different size grippers.
Gripper Options
With the exception of the Smooth inner / Smooth outer (25A / 12A)
Grippers are Shore A25 for inner gripper and A18 for outer.
wikipedia article on Shore durometers for further explaination
