This classy and elegant cobalt 6.5mm wedding band features a slight flat surface and offers comfort. Forge by Benchmark offers contemporary wedding rings in cobalt, titanium, Damascus Steel and tungsten. Some of our most durable and rugged wedding bands for men, our Forge line of wedding rings are sure to last a lifetime.-fit on the inside for unforgettable comfort. Forge by Benchmark offers contemporary wedding rings in cobalt, titanium, Damascus Steel and tungsten. Some of our most durable and rugged wedding bands for men, our Forge line of wedding rings are sure to last a lifetime..