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Features:OOTDTY A solid spring for 3D Printer Extruder.Excellent elasticity, fatigue resistance.Nickel plated, corrosion resistance, excessive 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: nine ringsSurface Nickel platedNo retail packagePackage Included:10 Pcsx three-D Printer Extruder Strong Spring