King Will Nature 6mm Silver Tungsten Carbide Ring Unisex Wedding Band Abalone Shell Inlay Faceted Edges Genuine Tungsten Carbide (Cobalt Free) Comfort fit,hypoallergenic 6mm width,and this is a abalone inlay tungsten ring King Will's jewelry box, save your giftwrap service fee, and help you store the ring much safer and longer. If you have any question, please post into "Customer Questions & Answers" at the bottom of this page.