Nuni Jewelry 8MM Tungsten Metal Men's Wedding Band Ring in Comfort Fit and Matte Finish Genuine Tungsten Carbide (Cobalt Free). Hypoallergenic, scratch resistant, Comfort Fit Design. Authentic Nuni Jewelry with LIFE TIME WARRANTY included. Highest quality guaranteed. Tungsten material is a very hard material that is very hard to damage and scratch. Stays nice and clean even after a hard day of work. If you have any questions, please post it in the part of "Customer Questions & Answers" below the page, you will get the answer by us or buyers as soon as possible.