At TIONEER, we use surgical grade stainless steel for our massive selection of metal jewelry. Surgical grade stainless steel is abundant in our collection due to its hard body, incredible resistance to corrosion and tarnish. Stainless Steel Obu Samurai Crest Hexagon Crest Flat Top Biker Style Polished RingSurgical Grade Stainless SteelEngraved Obu Samurai Crest DesignTop Dimension: 14mm x 12mm (0.55 inch x 0.47 inch) Standard Fit WearMinimalist Style Polish Finish