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Features:A solid spring for three-D Printer Extruder.Excellent elasticity, fatigue resistance.Nickel plated, corrosion resistance, high hardness.Specifications:Material: forty five carbon steelItem color: silver toneWire diameter: 1.2mm/0.05"Outer diameter: 7.5mm/0.30"Inner diameter: 5mm/0.20"Spring height: 18mm/0.71"Ring quantity: 9 ringsSurface treatment: Nickel platedNo retail packagePackage Included:10 Pcsx 3-d Printer Extruder Strong Spring