Package: This kit contains 12 PCS 0.4mm Brass High Speed Nozzles for High Speed Printing..Smooth Inside: Smooth inner wall without burr, minor viscosity coefficient, smoother tapping. Cutting chamfer design, reducing resistance, smooth feeding, barely blocking.Compatible Models: These nozzles kit is compatible with Creality K1, K1 Max, Ender3 V3 KE, CR-10 SE, CR-M4 3D printers.Better Compatibility and Applicability: Works with most printing materials such as PLA, ABS, PETG, TPE, TPU, PC, etc.12PCS Nozzles Kit: nozzles are made of high quality materials, which has better thermal conductivity and high hardness for better printing.