Very Attractive Domed 7 mm Celtic Knot Tungsten Ring for Men size 9 This Tungsten Wedding Band has Laser Etched Celtic Sailor's Knot all Around Domed with Matte Finish Polished Smooth Rounded Inside for True Comfort Fit Ring Perfectly Finished Scratch Resistant Material Genuine Tungsten Carbide is Very Hard but somewhat Brittle avoid droping it especially on Ceramic surfaces This is a Very Attractive Well Made Tungsten Ring for Men and Women. It’s Cobalt Free to avoid allergies and has the Carbides to make them Scratch Resistant. The curvature inside the ring is carefully measured and perfectly polished to provide a true comfort fit. A word of caution; tungsten material as hard as it is, it's a bit brittle and can shatter if it falls on hard surfaces such as porcelain tiles.