Cock rings help with endurance and work by keeping blood in the penis once its erect. This jet black version is thick softly rounded extra stretchy and super smooth. The high end pure silicone is extremely hygienic with a nonporous surface that's very easy to clean and sterilize; silicone is also hypoallergenic and body friendly perfect for anyone with sensitive skin. Always use a good quality water based lube if needed with the Silicone Cock Ring to keep the material strong. 1 3/4 inches (4.4cm).