High quality aluminum alloy material and sandblast to surface oxidization, ensuring this red extruder is last for long term use! The upgraded red extruder has removed pneumatic joint so as to increase gear density, preventing the joint fracture between pneumatic joint and Teflon tube. What's more, you can adjust the gear pressure of extruder in time by adjusting bolts. The optimized extruder with metal extrusion and original hot-end kit pushes the filament into printer nozzle, greatly making the red extruder retain powerful in filament feed-in. And the beveled filament intake can prevent scraping the filament as it is pulled into the feeder. You just remove the old Creality extruder & screw and then install the new red extruder. All the necessary accessories are included in the package.