1.steel grade:50# 65Mn 2.color:black,bright,yellow,blue 3.size: 0.25-3.0x30-250mm cold rolled,non- ... carbon strip Cold rolled,high carbon ,blue color spring steel strip1) Materail: 50# 65Mn2)Color: black, bright, blue ,yellow3)Specification: thickness: 0.3-2 ... .please feel free to contact me.and please note (material, color, thickness, width, HRC or usage), so that we could quote ...