... Information About the SpringMaterialStainless steel, carbon steel, spring steel, alloy spring steel, refractory steel, brass, bronze, etc ... equipment,electronic devices,etcPayment termsT/T, L/C,WULead-time15 daysPackaging Inner plastic bag, outer carton ... Certification ISO9001:2008 ,ISO14001and ROHsEquipmentsAdvanced CNC computer spring machines with high precision and efficiencyTechnology Experienced ...