2 inches Nitrile Cock Ring Black from Spartacus Leathers. Single black nitrile o-ring, available in 2 inches diameter size. This relatively firm ring can be used as a cock ring, or as a replacement ring on a dildo harness if you are in need of a different size. Spartacus Leathers - 2 inches Nitrile Cock Ring. Categories: Love Rings, Cock Rings, Classic Cock Rings, Mens Cock & Ball Gear. No Amazon Restricted. 2022.