Top selling Wedding Band Ring 8mm for men or women. This beautiful black tone tungsten carbide ring with black background and red color Celtic knot weave inlay design is 8MM in width. If you are looking for a ring that is scratch proof and forever keep its shine, then our Tungsten Carbide rings are for you. Tungsten Carbide is ranked second hardest next to diamond on the Mohs scale, diamond being a 10 followed by Tungsten Carbide as 9. Mens Wedding Bands Black and Red / Celtic Wedding Bands. Hypoallergenic. Our rings will not cause skin irritations or turn your fingers green. Due to the Hardness of Tungsten, these rings can be laser engraved, but not hand engraved. They CANNOT be stretched.