This extruder kit is an original replacement part for the Neptune 4 Pro 3D printer from Elegoo. The kit contains everything you need for a dual-gear direct extruder setup. You will receive a hotend kit, with an extended hotend, PTFE tube and a copper-titanium bimetal hotend throat. The extended hotend of this kit can handle temperatures up to 300˚C, which ensures that your filament is melted quickly and completely. This makes it possible to print with many different types of filament, such as PLA, PETG, ABS, PTU and Nylon. The bimetal hotend throat has an excellent heat conduction. The unique air ventilation system optimizes the airflow for optimal cooling, which reduces the chance of nozzle clogging. The 5.2:1 reduction ratio and the stainless steel dual-gear gears ensure a firm grip, which ensures that filament is fed evenly and that flexible filament does not get stuck. To prevent heat related issues the kit comes with 2 x 4015 double sided cooling fans. You can easily install this extruder kit thanks to the included screws and clear instructions.