Best flatness ,straightness, stability ,and the surface cleanness. 1) Materail: 50# 65Mn2)Color: black, bright, blue ,yellow3)Specification: thickness: 0.3-2.0mm width: 40-230mm4)HRC : 46-48 If you find that our products are suitable for your request.please feel free to contact me.and please note (material, color, thickness, width, HRC or usage), so that we could quote our best price .