Heavy Duty Brushed Finish Beveled Edge Super Comfort Fit Black Tungsten Carbide Wedding Band Highly scratch & wear resistant (NOT scratch proof). 10x harder than 18K gold, 5x harder than steel & 4x harder than titanium. As rigid as it is (unable to bend or be forced out of shape) this ring cannot be resized. Tungsten rings will break or shatter when dropped or slammed on hard surfaces. Perfect choice as an alternative wedding band, engagement band or promise ring, if you are allergic to the “noble” metals (gold, silver & platinum). These contemporary bands will neither give you allergies, nor turn your fingers green.