King Will Classic Men's 8mm Black Tungsten Carbide Ring Laser Irish Claddagh Engagement Polish Wedding Band 8mm genuine tungsten carbide ring with claddagh design, cobalt free All of tungsten rings are Cobalt Free and Hypoallergenic & scratch resistant& Comfort Fit Design High polished and comfort fit interior make you feel comfortable & elegance in your daily. King Will's Free 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.