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Wire Size Range: 0.05-80mm Material:music wire, spring steel, stainless steel, phosphor bronze, brass, chrome vanadium, as well as any other required. Finishes:Zinc plate, black oxide, shot peen,, as well as any other required. Extension springs are normally tightly wound helical springs that extend under a pulling force. Compared to compression springs, extension springs need additional considerations. These include attention to the differing stresses in the hooks, initial tension, deflection of the hooks and provision for overstretching during assembly must be made OEM and ODM are welcome. We can produce spring according to drawing, samples. If you demand such these, please contact me.