Spartacus Leathers Cock Gear Metal Cock Rings: Nickel Cock Ring 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. Spartacus A Passion For Quality Catalog page 26. Made in the USA.