PTFE Tubing: 100% Bowden PTFE tube with low friction for improved responsiveness, reduced retraction, more accurate prints, less slippage, reduced wear on the extruder, and decreased clogging when printing with thicker filaments. One tube cutter with an extra sharp razor is included. 0.4mm Nozzles: Manufactured using CNC precision automatic lathe and one-time forming technology to ensure a smooth, burr-free interior for consistent filament flow. Upgraded Pneumatic Fittings: Includes two PC4-M6 couplers for the extruder, designed for durability and secure fit. Two PC4-M8 couplers for the hotend offer high hardness, oxidation resistance, and corrosion resistance. Four collet clips are included to prevent Bowden tube slippage during extrusion or retraction. Die Bed-Level Springs: 4pcs upgraded bed-level springs made from high-quality material, resistant to fatigue and heat, built for long-term durability. Enables higher print speeds with improved bed stability. (Note: Springs are approximately 25mm in length, longer than those for Ender 3/Ender 3 Pro. Can be trimmed or bed height adjusted as needed.) Material: Brass Color: Blue + Gold Package Contents: 1 set of printer accessories Note: The package includes only the items listed. Other products are not included. Due to lighting and display differences, the item color may vary slightly from the images. Measurement may vary by 1-3cm.