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