Spartacus Leathers Cock Gear Metal Cock Rings: Nickel Metal Ring 3 Piece Set. One each 1.25 inches, 1.75 inches and 2 inches. Metal cock rings made with welded nickel. Cock rings when worn around the base of penis and testicles, many users find that cock rings increase sexual pleasure. Single metal cock rings, your choice of sizes, in nickel or black. Each sold separately. Spartacus A Passion For Quality Catalog. Made in the USA.