Benchmark Alternative Metal Cobalt Chrome 6mm Satin Band with Beveled Edges Men's Ring, Benchmark #CF66416CC. Authentic Benchmark cobalt chrome band with comfort fit and satin flat center with polished beveled edges. Width is 6mm. Cobalt Chrome is a unique alloy blend that consists of cobalt and other substances to form a bright white alternative metal. It is as white as platinum, hypoallergenic, unbreakable, and scratch resistant. These bands are light-weight, inside round comfort fit and very comfortable to wear. This metal has been used in medical applications for years. Occasional polishing may be required.