... ,coil,extension 3.carbon,stainless,alloy stainless steel tension spring Material:carbon spring steel,alloy spring steelrefractory steelstainless steel etc.(SWP SWC SUS304H) Applications ... , zinc plating, nickel plating, chrome plating Service:OEM,ODMCompetitive pricesFast deliverySmall order accept Packing:inner bag+inner carton+standard exporting carton stainless steel tension spring