Triple Ripple Metal Butt Plug approximate measurementsSmallOverall length: 130mmInsertable length: 125mmWidth at slimmest point: 14mmWidth at widest point: 30mmMediumOverall length: 155mmInsertable length: 148mmWidth at slimmest point: 15mmWidth at widest point: 35mmLargeOverall length: 160mmInsertable length: 152mmWidth at slimmest point: 21mmWidth at widest point: 40mm 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.