JustMensRings Tungsten Vertical Grooved Satin-Finish Wedding Band with Polished Edges | 8mm Sizes 8-15 All of our Tungsten Rings are Cobalt-Free 8mm Polished and Satin Comfort Fit Tungsten-Carbide Stamped for Authenticity Every Ring Comes with: 30-day Money Back Guarantee, Free Ground Shipping and FREE Ring Box.