This device is used for male constraint/adornment.

It consists of a series of nickel-plated steel rings connected by a leather strap. The first, largest ring goes over the cock and balls, and the cock alone goes into the other rings.

The rings get progressively smaller, confining the penis. This 5 ring version starts with a 1¾" ring, followed by two 1½" rings and two 1¼" rings. The entire length is about 3".