CoStainless Steel Springs Product Details 1. MaterialSpring steel, Stainless steel, Cu, Alloy2. Wire dia.Ø0.08mm~Ø10.0mm3. Coils3.54. Surface finishBluing, Cleaning, Zinc-plated, Passivation, Electrophoresis 5. Fatigue test5,000,000 times6. Salt spray test200~1000H7. Style of endsNo Grinded8. CertificatesISO9001, SGS,..