The black-laser Celtic knot design on this 10mm band, the ideal symbol of a lifelong love, stands out against the double-ridged edge made of polished cobalt. Cobalt is a silvery-white bio-friendly material with uncompromising strength that is scratch-resistant and will not chip or crack. This contemporary metal is also hypoallergenic and suitable for engraving. R10454-08 Dura Cobalt, 10mm width band Shatterproof, scratch-resistant, hypoallergenic Double ridged edge, black laser design Suitable for engraving Includes a custom Black Bow Jewelry Company gift box