Bomb Nipple Stretcher Weight325gram Weight - Use for Stretching or with Adult Toys. All weights come with an S hook. The S hook allows you to attach to larger Gauge CBRS, attach to ball weights, nipple clamps etc...Dimensions: 30mmx78mm Weighs: 325g Inner Diameter of hole is 5mm This product is certified 100% Non-Magnate and medical-grade steel. Beware of cheaper products that are not solid surgical steel but chromed steel or poor quality surgical steel that contains Magnate. Magnate is the ingredient that makes steel rust. We will only include this endorsement on our 100% surgical steel products.