... We have imported stainless steel,piano wire,carbon steel,phosphor,bronze and so on.wire pulling springs are new design springs Industry ... notable by their closed coil design and hooked ends. MaterialPiano wire, stainless steel, High Carbon Steel, Nickel Plated, Phosphor ... copper Bronze, Copper Bronze, Beryllium Copper.Wire Diameter0.1 mm ~ 10 mm and above.Outside Diameter1.0 ...