EnvyJ] 6mm Tungsten Rings Carbide Enamel Domed Round Brushed Two Tone Men's Women Wedding Band Ring Comfort Fit Finish Fit Size 5-16 w/Velvet Ring Box [Envyj] 6mm Tungsten Carbide Enamel Domed Round Brushed Two Tone Men's Women Wedding Band Ring in Comfort Fit Finish Fit Size 5-16 w/ Velvet Ring Box Lifetime Guarantee Free Shipping Our tungsten rings do not contain any cobalt, We use nickel binder for all our tungsten rings All tungsten 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 Our tungsten rings are hypoallergenic, ungsten carbide jewelry is hyopallergenic and chemically inert. It will not cause irritation or rashes on any skin type.