... . Zero-defect,high quality 3. Fatigue test>5000000 Steel spring Detailed description: 1) Spring Wire Diameter: 0 ... /wire formed spring. 3) Main material: High carbon steel, spring steel, stainless steel, bronze, alloy4) Advantage: Good hardness, resistance, durable ... ,washing machines,vacuum cleaners,lamps and lanterns,bicycles,sports equipment ,etc12) Packing: A. inner packing:polybag B. outer ...