Features An advanced upgrade kit for the printer, which can improve the performance and reliability of the printer. Reasonable designed, easy to install, does not occupy any effective molding space of your printer Made of high‑quality materials, strong and durable, has a long service life. With 4 flat‑end compression bed springs improve the rigidity and stability of the printing bed. The upgrade of the aluminum block in the kit allows for more reliable filament feeding. Specification: Item Type: 3D Printer Extruder Upgrade Kit  Specification: 4 x Leveling Large Nut 2 x Pointed Brass Nozzle 2 x PC4-M5 Pneumatic Connector 2 x PC4-M10 Pneumatic Connector 2 x Aluminum Block Silicone Socket 4 x Spring Package List:4 x Leveling Large Nut 2 x Pointed Brass Nozzle 2 x PC4-M5 Pneumatic Connector 2 x PC4-M10 Pneumatic Connector 2 x Aluminum Block Silicone Socket 4 x Spring   Package List 4 x Leveling Large Nut 2 x Pointed Brass Nozzle 2 x PC4-M5 Pneumatic Connector 2 x PC4-M10 Pneumatic Connector 2 x Aluminum Block Silicone Socket 4 x Spring