Doc Johnson Kink Endure Premium Silicone C-Ring Set in Black ZDJ-2402-01-CD. Designed to play extra hard while keeping him the same, the sturdy silicone Endure C-Ring Set hails from an epic collaboration between Doc Johnson and Kink.com. Shaped into wide silky bands, the thick plushy silicone grips comfortably and securely. Each can be worn in any combination, together or apart- try looping the larger over testicles and base with the smaller over the shaft, slip one over the shaft alone, or try the small as a ball stretcher. Ultra-smooth and completely seamless, the Endure rings are very suited to longer term wear. 100% body safe, completely hypoallergenic and extremely hygienic, the premium silicone rings clean easily using warm soapy water or a good toy care fluid/foam; they can also be boiled, bleached or run through the dishwasher (top rack, low heat, no soap) for thorough sterilization.