1、Applicable Models: This extruder kit is original upgrade parts for Ender 3, for Ender 3 Pro, for Ender 3 X, for Ender 5, for Ender 5 Plus, for Ender 5 Pro, for CR10, for CR10 V2, for CR10 S4, for CR10 S5, for CR10S, for CR10 Plus, for CR 20, for CR 20 Pro 2、Compatible Material: The extruder is lightweight and sturdy, ensures a more uniform feed rate, compatible with PLA, ABS, Wood, TPU, PTEG and more, 40 tooth drive gear feeds for 1.75mm filament 3、Aluminum Alloy Leveling Nut: The leveling nut is made of aluminum alloy, which is rust and corrosion resistant, more sturdy than plastic nuts, and tightened more tightly, making the hot bed more stable and easier to level the printer platform 4、Hot Bed Die Spring: Die spring is mainly used in die machinery, has light load, spring size is 8x25mm, suitable for Ender series 3d printer 5、Upgraded Driver: Upgraded feeder driver makes loading filament easier and smoother without worrying about scratching or breaking the filament