Spring Steel Wire(steel spring wire),mattresses spring wire Material: 45#, 60#, 65#, 70#, 42A, 62A, 72A, 72B, 82B, T9A, 65Mn Size range: 0.15mm-13mm Standards: GB/T 4357, DIN17223, EN10270, JIS G 3521 and so on Application: mechanical springs Packing: according to customers' specific requirements