Hells Couture POF Solid Steel penisring Available in 4 SizesXSmall: 6mmx15mmx35mmSmall: 6mmx15mmx40mmMedium: 6mmx15mmx45mmLarge: 6mmx15mmx50mmX Large: 6mmx15mmx55mmXX Large: 6mmx15mmx60mm 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.