... days 5 MOQ:500 pieces Ⅰ.Spring 1 Material : Titanium, Carbon steel, Silver, Nylon ... zinc-plated, rust preventive oil, titanium alloy galvanized, silver plating, plastic, ... 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 ...