... pieces Ⅰ.Spring 1 Material : Titanium, Carbon steel, Silver, Nylon, Cr5, Iron, Nickel plated carbon line, Nickel plated steel wire harp, Flat wire, Square wire, SUS304 ... spring, Extension spring, Torsion spring ,Coil spring etc7 Producing Equipment:Spring machine Jinju & 502S(Spring coiling machine, Pressure spring machine, CNC computer spring omnipotent machine, grinding machine,automatic spring ...