Edge Silicone Ball Gag is made using cowhide leather and silicone. Nickel free metal hardware. Removable silicone ball gag can be converted to a collar. Lockable buckle closure with 24 inches leather strap. Materials: 60% cowhide leather, 20% silicone, 20% nickel free metal. Includes: 1 interchangeable silicone ball gag, lockable with 24 inches leather strap.