Cloud 9 Pro Sensual Silicone Cock Ring Set in variable sizes. This premium set of Cloud 9 Cock rings can improve stamina and prolong your erection. Made of 100% super stretchy silicone in three different sizes. Cock rings may be used to prolong erection or assist with erectile dysfunction. Cloud 9 Novelties Silicone Stay Hard Ring Combo Pack includes a trio of super soft skin-safe rings that are made of phthalate free. non-toxic silicone. These rings are comfortable and made specifically for your safety and hygiene during intimate play. Cloud 9 Cock rings can be used individually or together. Do not wear a cock ring for more than 30 minutes at a time.