A tried and true favorite flat style created from cobalt, a silvery-white contemporary metal with uncompromising strength that will not chip or crack, is scratch resistant and hypoallergenic. As a lasting symbol of your commitment, this 6mm comfort fit polished band is designed to last a lifetime without losing its color or luster. R10426-12 Cobalt, a bio-friendly material Shatterproof, scratch-resistant, hypoallergenic Flat polished, comfort fit design Suitable for engraving Includes a custom Black Bow Jewelry Company gift box