Spartacus Leathers Cock Gear Metal Cock Rings. Black Steel Cock Rings Set comes with 3 different sizes. Steel is an excellent alternative for those with nickel allergies. Spartacus black steel cock rings make a striking visual statement with their black color. Nickel free. Black Steel Ring Set includes 1.5 inches ring, 1.75 inches ring and 2 inches ring. Set of metal cock rings, your choice of sizes, in nickel or black. When worn around the base of the penis and testicles, many users find that cock rings increase sexual pleasure. Prolong rings, erection enhancement, climax control rings, cock rings. Weighs 0.47 pounds. Black Steel Cock Rings Set from Spartacus A Passion For Quality Catalog page 26. Made in the USA.