[ PTFE Tubing]100% Bowden PTFE tube with the 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. One cutter with an extra sharp is also included. [0.4MM Nozzles]Made with centering CNC precision automatic lathe and one-time forming technology, make sure the interior of the 0.4mm nozzle is smooth without burrs, make out of filament smoother. [Upgraded Pneumatic Fittings]Two PC4-M6 Couplers for the extruder, are sturdy and . Two PC4-M8 Couplers for the hotend, are high hardness, antioxidation, anti-corrosion. 4 collet clips are also provided for eliminating any potential slippage of the Bowden tubing whilst extruding or retracting. [Die Bed-level Springs]4pcs Upgraded bed-level springs are made of high-quality Material, fatigue and heat-resistant, for use. They will allow you to print at a higher speed without worrying about any wobble. (NOTE: The springs are around 25mm long, which is longer than for 3/ 3 pro/. You may use a tool to cut it to be shorter if you need it or adjust the hot bed to be higher to fit the springs.) Material:brass, metal colour:blue + gold Package Contents: 1 set * printer accessories Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.