Jennings Mouth Wire Gag When wide open is not enough! This 7.5mm medical grade surgical steel wire gag stretches the mouth and keeps it from closing, keeping your partner's mouth open for whatever you wish to put in it! Approximate Measurements: Large Width: 155mm Max Opening: 45mm 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.