XIKAR Xi2 Cutter - American FlagThese cutters have blades hardened to a Rockwell C rating of 57, the result is the hardest, sharpest blade you can buy. The body retains the classic XIKAR shape and features a lightweight, nylon fiberglass composite in an assortment of metallic colors and now, carbon fiber look and mesh patterns on black. Xi cutter blades are made of high quality 440 stainless steel with an HRC of 57. All Xi cutters are the same ring gauge: they will cut a 54 ring