Zhejiang Kai He produced at mechanical Brake System-Accessory Kit,Calipers HARDWARE, DISC BRAKE HARDWARE (QUIET CLIP,PAD CLIPS,ANTI-RATTLE SPRINGS, Spring) DRUM BRAKE HARDWARE (LEVERS STRUT ADJUSTER LEVER Spring) Card spring products are of good quality (Material:SS30301-30304 2.Hardness:37-42HRC 3.Treatment:Original color/1.Material:SAE1065-1090 65Mn 2.Hardness:42-55HRC 3Treatment:Galvanization (Blue color,White color,Color), Dacro processing,Nickel plated,Black processing) processing possible (standards: OE number: FMIS CTD Drawing) many types are exported, long-term development of new products and custom products company headquarters. Welcome to inquire and messages, visit the purchase!