Spartacus Leather Cock Gear Plain Leather Cock Ring. 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. Oil tan leather is stronger and stiffer than sewn garment leather. These oil tan rings are firm but soft. Original Plain Jane Leather Cock Ring with snap closure. Adjustable. Spartacus A Passion For Quality Catalog page 28. Made in the USA.