Spartacus Leathers Cock Gear Metal Cock Rings.1 3/4" Nickel Cock Ring. Single metal cock rings, your choice of sizes, in nickel or black. Spartacus nickel cock rings make a striking visual statement with their silver color. Made using Nickel. Single metal cock rings, your choice of sizes, in nickel or black. Weighs 0.31 pounds. Contains Nickel not for individuals with allergies or sensitivities to this material. Spartacus A Passion For Quality Catalog page 26. Made in the USA.