Odyssey Rings 8mm Brushed Tungsten Carbide Wedding Ring for Men Superior to Titanium in terms of weight and durability. Nickel Binder, Cobalt Free & Scratchproof. Elegant Design w/ 5mm Brushing on Center and Beveled Edges on exterior and interior for reduced irritation Lifetime Guarantee covers Replacement for size changes or Accidental Breakage (Not valid w/coupons) Retail Quality-- the same ring available at Chain Jewelry Store without the crazy markups. Approved & Marked w/ the Special Insignia of the Council of Olympian gods For most accurate sizing and to avoid delays, get sized for a Tungsten ring at your local jeweler