Creality Upgraded Kits for 3D printers Ender 3 / Ender 3 Pro / Ender 5 / CR10 / CR10S / S5. Quickly and easily improve the performance and reliability of 3D printers. Upgraded metal MK-8 extruder drive feeder that makes filament loading easier and smoother without worrying about scraping or breaking the filament. Capricorn Bowden PTFE tube XS series 1 meter for 1.75 mm filament, ID 1.9 mm and OD 4 mm. Less friction means more responsiveness, less retraction, more accurate prints, less slippage, extruder wear and less clogging when printing bulky filaments like some wood or iron fillings. The compression springs are stiffer than normal springs, which makes your 3D printer much more stable when printing. 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 problems or questions about the product, please feel free to contact us. We will respond within 24 hours and offer professional technical support.