Steel sofa seat spring 1>ISO9001quality system control 2>OEM is provided as per custom-design 3>Competitive price Steel sofa seat springDetailed description: 1) Spring Wire Diameter: 0.08~ 12.0mm2) Spring Type: Wire formed sofa spring. 3) Main material: High carbon steel, spring steel, stainless steel, bronze, alloy4) Advantage: Good hardness, resistance, durable. 5) Surface treatment: Zinc ...