... precision 2012 Newest Drawing Steel Compression Spring1) main material: carbon spring steel ,alloy spring steel, refractory ... chromium-plated, zinc-plated, gold-plated, silver-plated, copper-plated, tin-plated and nickel-plated, painted, spraying powder ... wire, stainless steel wire, spring steel, brass, aluminum, copper, alloy, etcSurface treatmentpolishing, anodizing, zinc plating, nickel plating ...