This is a double metal cock ring set. One ring goes behind the balls, and the other goes in front... connected by a strip of sturdy black leather.
The medium size has a 1¾" ring and a 1½" ring.
The large size has a 2" ring and a 1¾" ring.
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The Double-O Cock Ring Set (A442) currently sells for $14.50.
Go to the Stockroom for more details and other items.