A cock ring or cockring is a ring that is place around a man's penis, usually at the base, primarily to slow the flow of blood from the erect penile tissue, thus maintaining erection for longer. Cock rings can be worn around just the penis or penis and scrotum, or just the scrotum alone, though this is usually designated as a testicle cuff. Rings can be made of a variety of different materials, most commonly leather, rubber, or silicone, though nylon and metal are also used either as the main component or part of the closure. Confusingly, the term cock ring is sometimes used as a synonym for a Prince Albert piercing, a piercing of the penis that is often, though not exclusively, a metal ring.