... ---80mmMaterialCarbon steel, alloy steel, stainless steel, ectSurface treatmentZinc, nickel, black paint, electroplating, power coating 1) main material: carbon spring steel ,alloy ... alloy and bronze of the suspension spring2) Finish: chromium-plated, zinc-plated, gold-plated, silver-plated, copper-plated, tin-plated and ...