seat spring 1>wire dia:0.2-8mm 2>factory price and high quality 3>OEM service 4>CNC automatic productio seat spring Specification: Product Nameshaped SpringWire diameter0.0079in(0.2mm) to 0.31in(8mm)MaterialStainless steel, carbon steel, spring steel, alloy spring steel, refractory steel, brass, bronze, etc.Surface treatmentZinc-plated, nickel-plated, chrome-plated, silver-plated, gold-plated, ...