100% Liquid Silicone Ring, 1.18" (30mm) inner Diameter, stretches up to three times its size. Perfect for those that like color options this, double-sided ring features two colors in one ring. The F-19 has a thicker band that is stretchy enough to wear around the testicles or at the base of the penis, but is firm enough to offer larger, harder erections that can intensify the sensation of an orgasm.