Ball Stretcher for Attaching Weights These surgical steel ball stretchers are a must have for any bondage play boy. Hang your balls low and add some more weight for the experienced users. Approximate MeasurementsMEDIUMWeight: 430gramsInternal Diameter: 35mmWidth: 13mmThickness: 30mm 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.