This quality Vibrating Leather Cockring wraps snug around the base of the penis and underneath the testicles to help regulate blood flow and maintain an erection. As a bonus, a powerful vibrating bullet attached at the top adds for great clitoral stimulation for her, and makes your entire package vibrate There are 4 snaps that allow you to find the most comfortable adjustment. Measurements: Adjusts from 4 inches to 7.5 inches in circumferece, 0.75 inches wide. Material: Leather, metal, ABS plastic. Color: Black. Note: Requires (3) LR44 tab batteries, included