Hunky Junk Cog Ring 2 Size Double Pack - Tar & Stone Pack of 2Cog rubbery c rings are a 2 piece pack of 1 small + 1 large COG c ring in one pack. COG is designed for guys that like a heftier super stretchy c ring, the set allows the user to wear the size that gives the right grip for play, or use one as a c ring and the other as a thick ball ring. A groove inside the ring that holds a bit of lube for comfortable wear and an inner ring that flattens as COG stretches so it stays where you want it it will not roll