Highest quality materials are used and 100% made in Switzerland.The upper ring slides over the hard penis and the cuff is tightened. Then you pull the second loop over the testicles and the lower cuff is tightened firmly, so that there is no pain (fastening by feeling - risk of congestion of the veins). Note: you must tighten the cuff carefully, so that the skin is not pinched.Features: black rubber round cord made of NBR - elastomer (nitrile), 5 mm, hardness of 70 banks. High strength and elasticity. Highly resistant to oils, gasoline and heat. The noble cuff is made of hard-aluminum and treated with an anodized color. Use a disinfectant for cleaning such as Kiotos toy cleaner.