EnvyJ Black 6MM Tungsten Carbide Mens Wedding Band Ring Comfort Fit 8-16 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 In case of medical emergencies, our tungsten rings can be removed by medical professionals Tungsten Carbide rings are hypoallergenic, ungsten carbide jewelry is hyopallergenic and chemically inert. It will not cause irritation or rashes on any skin type.