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The elves keel ring cock ring is a 3 in 1 ring that can be placed around a penis, usually at the base, primarily to slow the flow of blood from the erect penile tissue, thus maintaining an erection for a much longer period of time.

Cock rings can be worn around just the penis or both the penis and scrotum, or just the scrotum alone, though this is usually called a testicle cuff. Rings can be made of high-quality silicone with special shape.

The term cock ring is sometimes used as a synonym for a Prince Albert piercing, a piercing of the penis that is usually, though not always, a metal ring.

When used in cases of erectile dysfunction they are known by various names such as "erection ring" and "tension ring".