Sex, love, passion. Prolong and strengthen your erection with soft and stretchy Silicone Penis Rings that gently restrict blood flow for a uniquely sensual experience. Each size delivers a different intensity. Specifactions: 3 piece Penis ring set. Small cock ring inner diameter 1.33 inches. Medium cock ring inner diameter 1.5 inches. Large cock ring inner diameter 1.75 inches. Thickness of rings 0.37 inch. Made from body safe materials phthalate and latex free Silicone. Waterproof, non-vibrating cock rings.