... 1.good quality material:55CrSi 2.high standard of workmanship 3.rich experience spring, coil spring, car spring, coloful springOPEL VECTRA B 10 ... .95- REAR L&R(OE 90 497 912)zero-deect,high ... plating,Powder Coating,Polishing,etc. the coil compression spring is resistance to both high/low temperature and high pressure. coil ...