Do not know the right cock ring size for you? Get the H2H Nitrile Cock Ring 3 Pack from PHS International. Includes one of each: Small ring 1.5 inches, Medium ring 1.75 inches, Large 2 inches. Try them on for size and see which one suits your pleasure rod the best. The nitrile rings are 100% skin safe, compatible with all lubricants, phthalate free and hypoallergenic.