Sportsheets Collar with Nipple Clamps. Gorgeous, vegan leather collar with attached nipple clamps provides constant stimulation. Soft, double layered, hand stitched, PVC collar adjusts with a quality, roller buckle closure. The two coated nipple clamps have tension adjustments and are attached to the collar with 10.5 inches chains. Perfect for nipple stimulation and many other sensitive areas. Nickel-free. Features: metal d-ring for attaching other devices. Metal chain connects link chain to each individual nipple clamp. Each clamp has a tension screw located at top of clamp. Alligator style ends are tipped in black rubber to add to comfort. collar length 15.75"