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Progress Sport Springs are wound from only certified high-tensile SAE spring wire materials. They are then cold-wound on modern CNC coiling machines, stress relieved, pre-set and shot-peened for maximum durability.
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![]() |
Progress Sport Springs are wound from only certified high-tensile SAE spring wire materials. They are then cold-wound on modern CNC coiling machines, stress relieved, pre-set and shot-peened for maximum durability.
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