Rock Solid Gear C Ring Beginner friendly Prolong Erection Non-Vibrating Penis Ring The super stretchy ring will expand and contract with the body keeping a snug fit. Made using phthalate-free, non-toxic materials Thermoplastic Elastomers TPE. Wash before and after each use. Always use a water-based personal lubricant with this product for maximum pleasure. Materials: TPR/TPE Color: Clear.