King Koe Unisex Tungsten Ring 6mm Hard-wearing Primary color Matte Finish Comfort Fit Six-Months money back guarantee or exchange. Life time warranty Made of genuine tungsten carbide. Hypoallergenic, scratch resistant, durable and free of Lead and Nickel and Cobalt. 6mm Polished Tungsten, great as a wedding and engagement ring for men High Polish Smooth Inner Face, Comfortable Wearing. The smooth and gentle contrast of the polished beveled edge and the satin/brushed finish center is exquisite. All rings come with Ring Box, save your gift-wrap fee, and help you store the ring.