... manganese steel wire, phosphorus copper wire, nickel-plated wire, zinc-plated wire, tin-plated copper wire, nickel-plated steel ... copper, beryllium copper. Surface treatmentNickel-plating, zinc-plating, tin-plating, copper-plating, black Oxide. gold, silver, etc., salt spray test more than 100 H. ... areaMalaysia, Holland, America, Thailand, Venezuela, Shipping ways: zinc plating small torsion springs