The 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″ chains. Perfect for nipple stimulation and many other sensitive areas. Nickel-free.