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 Soma Samurai Crest Chevron Pattern Biker Style Polished RingSurgical Grade Stainless SteelEngraved Soma Samurai Crest DesignApprox. Top Dimension: 0.59 inch x 0.59 inch (15 mm x 15 mm)Standard Fit WearPolished Finish Style