Smart looking and unique, this 8 mm mens tungsten ring has highly polished tiered edges with a carbon fiber insert in the center. Made by customer request, it is one of our most striking tungsten carbide wedding rings! Tungsten is an extremely strong and durable metal, and it is always cobalt-free. The inside of this ring has rounded edges for a smooth and comfortable fit. Comfort-fit rings should be ordered 1/2 size smaller!