These non-adjustable endurance style nipple clamps with chain from Ouch! are easy to use and suitable for both him and her. The clamps and chain are made of stainless steel and aluminum, and are completely nickel free. You can use the nipple clamps for your naughty secrets, or for extra stimulations while making love. Dimensions 1.97 inches by 3.54 inches by 5.51 inches. Weight 2.29 ounces. The clamp is flat at the end no teeth.