Spartacus Leathers Cock Gear Leather Cock Rings. Black Leather Velcro Sewn Cock Ring is adjustable from 1.25 inches to 2 inches Made of high quality garment leather, this cock ring is hand sewn for comfort and durability. Velcro closure offers easy on/off action. Carefully rolled sewn garment leather gives these rings a silky texture. Cock rings when worn around the base of the penis and testicles, many users find that cock rings increase sexual pleasure. Hand crafted leather goods from Spartacus Leathers.