1).Designed by Jinsheng. 2).Material: Oil hardened and tempered 55CrSi 3).Surface treatment: powder coating 1.We are the professional spring manufacturer for OEM, such as BYD,Chery,Hama,etc.2. Used in automotive suspension systerm.3.Certified by ISO90001 and TS16949.4.Cold coil by CNC coil machine.5.Surface treatment: powder coating. Red,black,etc painting as pre customer's requirement.6.Good ...
