VEVOR Garage Door Torsion Springs, Pair of 0.25 x 2 x 28inch, Garage Door Springs with Non-Slip Winding Bars, 16000 Cycles, Gloves and Mounting Wrench, Electrophoresis Coated for ReplacementPrecision Engineering for PerformanceUpgraded And Improved TechnologyDurable Beyond CompareQuick & Hassle-FreeSafety FirstSpring with ElectrocoatingService Life: Approximately 16,000 Cycles (opening + closing),Net Weight(Include accessories): 24.69 lbs / 11.2 kg,Spring Size (Wire Dia. x Inner Dia. x Length): 0.25 x 2 x 28inch / Φ6.35 x Φ50.8 x 711.2mm,Item Model Number: GZ-28,Rotation: 1 x Dextrorotary + 1 x Levorotary,Main Material: High Carbon Steel 82B + Cast Aluminum ADC12