... 2.3mm thickness 8mm-300mm width blue,white,yellow,black,polished Hardened and tempered steel stripMaterial: ck50 ... widthSurface finished: bright,white,blue, polished, yellow, blackHardness: 40-55HRC for hardened and tempered processEdge: slit, round, squarePacking ... high strength, toughness, hardness and elongationGood tolerance for thickness controlledColoured Tempred steel strip 50CrV4 alloy spring ...