1.5 inches Nitrile Cock Ring Black from Spartacus Leathers. Cock rings have been making our intimate moments even more memorable for years. They have changed with our desires and now come in an assortment of options to meet our needs. Selecting a cock ring can seem a bit overwhelming. Do not worry, our guide will help you get a grip on cock rings and find the right ring for you. Information for your knowledge Thermoplastic Rubber TPR and Nitrile: Rubber and nitrile rings are pliable and strong, yet provide minimal stretch. They come in 3 sizes and a variety of colors. Single black nitrile o-ring, available in 1.5 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 - 1.5 inches Nitrile Cock Ring. Classic Cock Rings, Mens Cock & Ball Gear. Categories: Love Rings, Cock Rings, Classic Cock Rings, Mens Cock & Ball Gear.