This hot steel ring and ball piece will help you enjoy hot genital bondage. You place the head ring around the head of the cock. In doing so, you increase the sensations during foreplay and intercourse. The head ring, specifically, makes the head glans harder and more sensitive, so all of the stroking and massaging will make things more intense. The ring has an inside diameter of 25mm (a little under 1") and the ball has a diameter of 10mm (nearly 1/2"). The steel head ring is made of 3.2mm thick stainless steel.