8mm Tungsten Rings Carbide Black High Polish Men's Wedding Engagement Band Ring Comfort Fit and Matte Finish Sizes 6-16 All Rings [Free Shipping] Tungsten rings are 100% scratch proof, our tungsten rings will not bend out of shape Tungsten Carbide rings do not contain any cobalt, we use nickel binder for all our tungsten rings Tungsten Carbide rings are covered by our lifetime warranty against scratches and breakage Cobalt Free, 100% scratch proof, tungsten rings can be removed by medical professionals Tungsten Carbide rings are hypoallergenic, tungsten carbide jewelry is hypoallergenic and chemically inert. It will not cause irritation or rashes on any skin type.