Silicone Penis Ring Set Easily strengthen your penis - instantly! This set lets you choose from 3 sizes of stretchy, smooth silicone. Each ring fits snugly at the base of your member to help you stay harder for longer. By gently restricting blood flow, you can enhance any playtime experience, solo or with a partner. Waterproof and body safe, this trio clean up in a snap with some Adam & Eve Toy Cleaner and a warm water rinse - 3 piece penis ring set - Soft & stretchy silicone - 0.94 cm thick Prolongs & strengthens erections - Each size creates a different intensity - Small: inner diameter: 3.38 cm - Medium: inner diameter: 3.81 cm - Large: inner diameter: 4.45 cm - Phthalate & latex free waterproof.