Have a glowing good time with this stretchy. comfortable glow in the dark cock ring! The Performance Silicone Glo Pro Cock Ring is a soft. stretchy ring crafted for maximum comfort. The flat design fits around your shaft for no slip performance. The Glo Pro's body safe. hypoallergenic silicone features a satin smooth glow in the dark design. It is easy to clean. Just wash with soap and water and let air dry.