Outdoor Edge Razor Safe Replacement Blades, Plain Edge, 20J2 Stainless Steel, (4) 3.5 Guthook Blades RRG-4 A set of four razor gutting blades made from Japanese 420J2 stainless steel open game like a zipper without piercing vital organs. Each blade is precisely heat-treated and hand-finished to a surgically-sharp cutting edge.