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Package Included:1 pcs aluminum heater block, 2 pcs 0.4MM brass extruder nozzles and 2 pcs 1.75mm tubesMK8 extruder hot end kit, white wire is temperature thermistor, red wire is heating tubeOutput diameter: 0.4 mmInput diameter: 1.75 mmVoltage: 12VBrass nozzle specifications:Model: 0.4 mm extruder brass nozzle print headMaterial: brassColor: goldInput diameter: 1.75 mmOutput diameter: 0.4 mmSize: 5 * 13mmExtrusion tube specifications:Type: Nozzle ThroatCompatibility: 3D printerMaterial: Stainless steelExternal thread: M6Nozzle throat diameter: 4 mmNozzle throat outer diameter: 7 mmTeflon tube inner diameter: 2 mmFilament diameter: 1.75 mmLength: 30 mmNote: Widgets are small and sharp, away from children