Black Tungsten Rings for Men Size 8, 9, 10, 11, 12 & 13. Tungsten Carbide Ring 8mm w/ Carbon Fiber Inlay. Wedding band ring Comfort Fit Tungsten Mens Rings. 8mm comfort fit wedding band (10) 8mm Tungsten Carbide Ring with Black Carbon Fiber Inlay Other Sizes & Ring Styles Available - Amazon Search "C&D Jewelry"