The Stacker Ring 1.6'' (40mm) is a distinctive ring, slightly wider than a standard cock ring. This makes it ideal for use as either a cock ring or a ball stretcher. You can mix and match these rings with other sizes of Stacker rings for varying levels of cock and ball stretching. Alternatively, use one on your cock, one on your balls, and the other around both. The possibilities with the Stacker Rings are limitless.