CB2000 Male Chastity Device is an innovative design for todays active man. The material being used is a highly durable plastic made of Polycarbonate. The strength of this material exceeds that of acrylic and many other plastic blends. It is transparent in color.There is a center recessed hole that accepts the locking pin. There are two side holes that accept the guide pins from the B ring. The guide pins are designed to take the torque when one becomes erect. The A ring comes in five different sizes: 1 1/2" I.D., 1 5/8" I.D., 1 3/4" I.D., 1 7/8" I.D. and 2.0" I.D. The five A rings are included with each order. This helps to eliminate the need to find an exact size. (see points of intrique for more security)