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 Nautical Compass Dial & Anchor Chevron Pattern Biker Style Polished RingSurgical Grade Stainless SteelEngraved Nautical Compass Dial & Anchor DesignApprox. Top Dimension: 0.59 inch x 0.59 inch (15 mm x 15 mm)Standard Fit WearPolished Finish Style