This small size device is made from clear medical grade polycarbonate, it's designed to be worn underneath clothing, it has a bottom opening allowing use at urinals, 5 different size base rings, and spacers, which allows a perfect fit.
 

Package Includes:

1 x cage portion - 2 1/2" length 1 3/8" inside diameter cage - most popular size 
5 x ring sizes - 1 1/2"I.D., 1 5/8"I.D., 1 3/4"I.D., 1 7/8"I.D., 2"I.D. 
1 x Locking pins and spacers 
1 x brass padlock; 
5 x individually numbered plastic locks (With retail packaging)