This incredible Cobalt 9mm comfort-fit four-sided band features a satin-finished center and a high polished beveled edge. Cobalt is 4x harder than Platinum, 5x harder than Gold and 7x harder than Silver. It is hypoallegenic, scratch resistant and shatter proof. This ring is also available in Titanium or Tungsten. If interested in Titanium or Tungsten, please call for pricing.