Unisex 6mm Tungsten Carbide Wedding Band with Celtic Knot Design (US Sizes 4 - 13) Brand New Item! Great Anniversary Gift! Comfort Fit Cobalt Free Unisex 6mm Celtic Knot Tungsten Carbide Band Sleek Tungsten Ring - Not Resizable but we are more than happy to exchange it for you. Shape: Flat with Step Down, Rounded Edges; Finish: Combination **Please verify your size before checking out**