Oval Ball Steel Stretcher Weights The rounded edges really make these ball stretchers stand out yet they stay simple with their split ring design. This means that instead of having to pull the scrotum through the opening it can be closed around the balls.This allows the ball stretcher to be thicker and the opening to be smaller. The ball stretcher is opened and closed with one bolt that can be screwed or unscrewed with a standard-size Allen key (included) Available in 3 sizesapproximate measurementsSmall: Weight: 350g/Inner Diameter: 35mm/Overall Diameter: 60mm Depth: 30mmMedium: Weight: 440g/Inner Diameter: 35mm/Overall Diameter: 60mmDepth: 40mmLarge: Weight: 595g/Inner Diameter: 37mm/Overall Diameter: 60mmDepth: 60mmXLargeWeight: 685g/Inner Diameter: 35mm/Overall Diameter: 60mmDepth: 70mm 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.