Spartacus Leathers Leather Cock Ring Nickel Free is adjustable 1.25 inches to 2.5 inches. These simple leather cock rings can adjust along three different snaps. Available with standard hardware in firm sewn black leather, soft black leather, and soft red leather. Now also available in soft black leather with nickel-free hardware for sensitive skin. Cock rings 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. Spartacus Leather A Passion for Quality. Made in the USA. New images added February 1, 2013.