It is a kit for 3D printer accessories, it is a kit for 3D printer accessories. The use of a large number of MK8 brass extruder nozzles for 1.75mm filament and provides a simple way to upgrade the hot end. It is suitable for 1.75mm PLA ABS 3D printer and it is an excellent alternative hot ends for MK8, i3, Anet A8, Alunar M508, CR7, V2, etc. Features:1. The use of a large number of MK8 brass extruder nozzles for 1.75mm filament provides a simple way to upgrade the hot end. 2. 12V / 40W high temperature resistant heating rod (line length 1m / 39.4 in), working temperature range: 0 ~ + 280C (0 ~ + 538F). Heating block is used for fixing screw: M6 and M3. 3. The size of aluminum heater block is 20 * 20 * 10mm, with the necessary screw. Perfect match with daily filaments, such as PLA and ABS. 4. The 4.30 mm length extruder and 1.75 mm tube are made of aluminum. It is durable and stable.5. Suitable for 1.75mm PLA ABS 3D printer. By improving the internal surface finish, the extrusion force is reduced and the reliability of retraction is improved.6. You can use this kit to repair the extruder, instead of replacing the new extruder when the extrusion reaches an irreparable blockage. It is an excellent alternative hot ends for MK8, i3, Anet A8, Alunar M508, CR7, V2, etc. Specification:Condition: 100% Brand NewItem Type: 3D Printer AccessoriesMaterial: Aluminum + stainless steel + brassNozzle Size: Approx. 0.4mm / 0.02inLine Pipe Height: Approx. 30mm / 1.18in, suitable for 1.75mm PLA ABS 3D printerWeight: 95g / 3.4ozMK8 extruder heating kit, white line for temperature thermistor, red line for heating tube 12V / 40W. Package list :1 * Extruder Heating Aluminum Block Kit10 * Nozzle10 * Line Pipe .