Compatible Products: These nozzle sets are compatible with K1 and K1 Max. Please confirm your 3D printer model before ordering. Ultra-Hard Steel: These nozzles are made of high-quality hardened steel, giving them a longer lifespan than brass nozzles. They are easy to clean and won't clog easily during printing. The inlet and outlet holes are manufactured using precision CNC automatic lathes and one-piece casting technology. Perfect Printing: The precise design of these nozzles, a symbol of attention to detail, allows for unparalleled control and accuracy. From complex to intricate designs, it ensures perfect layer reproduction and enhanced color fidelity. Compatibility and Ease of Use: Suitable for most FDM printing materials, such as PLA, ABS, PETG, TPE, TPU, PC, etc. (1.75 mm). The kit includes: 5 x 0.4mm hardened steel nozzles, 5 x 0.4mm nozzle cleaning tools, and 1 x curved nozzle. Color: As shown. Material: Plastic-coated steel. Package Contents: Specifications: 5 x 1.75mm/0.4mm K1 hardened steel nozzles. The above package contents are the only items included; other products are not included. Note: Due to lighting and different displays, the color of the item in the picture may vary slightly from the actual item. The measurement error allowed is +/- 1-3cm.