1*Upgraded Creality All Metal MK-8 Extruder Feeder Drive 1.75mm Filament for Ender 3/3 Pro/3 X, Ender 5/5 Plus/5 Pro, CR-10 Series, CR-10S, CR-10 Plus, CR 20/20 Pro, CR-X.It makes loading the filament easier and smoother, no worries about filament scraping or breaking. 1*1 Meter Original Capricorn XS Serious Bowden PTFE tubing with lowest friction on the market. Less friction means more responsiveness, less retraction, more accurate prints, less slippage, wear, and tear on the extruder, and less clogging when printing chunky filaments such as some woodfills or ironfills. 1 pair- small and large pneumatic couplers to secure PTFE in extruder and hotend. 4* bed-level springs for stiff and accurate bed leveling. NOTE: The springs are around 25mm long, which is longer than ender 3 and ender 3 pro printer springs. You may use a tool to cut it to be shorter if you really like this product or adjust the hot bed to be higher to fit the springs. Professional Customer Support - If you have any problem or question for our product,please feel free to contact us. We will repond within 24 hours and offer professional technical support to you.