AUGUSTUS Tungsten Wedding Ring with Bevels and Blue Carbon Fiber Inlay - 4mm - 10mm Premium blue carbon fiber is joined together with the awesome strength of Tungsten Carbide to create this line of unique Comfort Fit Tungsten Rings by Thorsten Rings. This ring is a flat style with beveled edges and the light blue carbon fiber is inlaid seamlessly into the center. Larson Jewelers is proud to be one of the few retailers in America to carry a blue carbon fiber tungsten ring. This style is available in 4 mm, 6 mm, 8 mm, and 10 mm wide for couples who would like a matching set. Tungsten Carbide is extremely scratch resistant and is a great choice for those who want jewelry to be both maintenance free and worry free. Truly Free Lifetime Sizing and Lifetime Warranty on all tungsten rings, no exchange|sizing fees, which are charged by our competitors.