Spartacus Nitrile Cock Ring Set in Black, these amazingly durable cock rings are made of 100% skin-safe nitrile, the same material used in hospital gloves. Nitrile c-rings are strong yet flexible, snapping back to shape after each use. And not to worry, they're compatible with silicone & water-based lubes! Set includes 1.25", 1.5" and 2".