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Parabolic Leaf Springs for Heavy-Dutytrucks. Premium Material Options: Available in SUP9, SUP10 (50CrVA), 50CRV4, 51CRV4, Sup9, Sup10, and 60Si2Mn. Multi-Color Customization: Customizable colors include Black, Gray, Deep Gray, Red, and Blue. OEM Service Available: We accept OEM orders to meet specific customer requirements. ISO/TS16949 Certified: Manufactured under strict ISO/TS16949 quality standards for international markets. Comprehensive Testing: 100% hardness, magnetic particle, and dimension inspections performed. Fast Off-Season Delivery: Lead time within 15 workdays during off-peak seasons. Professional Coating: Options include shinning black, dark black, grey, red, and galvanized finishes.