This trio of Toynary cock rings are made of medical grade pure silicone, they are safe, flexible, silky smooth and durable. The set comes with 3 rings of different sizes, inner diameter measuring 3.2cm, 4cm and 5cm. Wear a single ring around the bottom of your penis or penis and testicles or wear all three for a graduated restriction that helps virility. Soft and normal version are available for your own preference and choice.