Our ISENGARD concave tungsten carbide ring features a classic concave curve running through the entire band. The surface is polished to a chrome-like shine to give it a contemporary touch while the underside of the band is shaped for comfort fit. The ISENGARD ring is available in three widths from 4mm, 6mm, and 8mm made from hypoallergenic tungsten carbide metal. Tungsten carbide will not rust or oxidize and does not scratch easily, ensuring that your ring will remain as sharp as the first day you put it on.