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High-Quality Industrial Needs Extension Springs for Various Applications Plastic Dippingi Tension Spring. Customized Size and Color: Size and color are fully customized to meet specific customer requirements. Multiple Material Options: Available in Stainless Steel, Spring Steel, Music Wire, and various alloy steels. Extensive Finish Choices: Offers Zinc, Nickel, Chrome, Tin, Silver, Copper, Gold, Dacromet, and PVC dipping. ISO and IATF Certified: Certified with ISO 9001:2015, IATF 16946:2016, BV, RoHS, and TUV. Fast Sample Delivery: Samples can be delivered within 3 to 5 working days for quality verification. OEM Manufacturer: Established in 2004, specializing in springs and stamping parts with 17 years experience.