1、Applicable Model: The 3D printer nozzle kit includes 0.4mm brass and hardened steel extruder nozzle, with high flow rate and high temperature resistance, suitable for ELEGOO Neptune 4 and for Neptune 4 Pro. 2、Fast and Smooth: The thermal conductivity of brass gets up to 330W/m·k, bringing high flow rate and high speed printing, ensuring more uniform heating of the nozzle and supporting 600mm high speed printing, and the uniform nickel coating on the surface greatly reduces the adhesion of fine metal wires to the nozzle, resulting in smoother extrusion. 3、Applicable Materials: 3D printer nozzles are suitable for most FDM materials, such as PLA, ABS, PETG, TPE, TPU, PC, etc., as well as high temperature filaments such as PEEK, PEKK, PEI, PSU, PPSU, etc. 4、Excellent Material Handling: The extruder nozzle ensures rapid heating and continuous printing of high temperature filaments. 5、High Accuracy: The inner wall of the nozzle is smooth without burrs, with low viscosity coefficient, and the diameter error of the extruder is less than 0.02mm. Whether you are printing conventional filaments or more challenging materials such as carbon fiber and glass fiber, we can provide you with accurate and smooth extrusion. Item Type: 3D Printer Extruder Nozzle Material: Brass, Hardened Steel Package Includes: 2 x 0.4mm Brass Nozzles 2 x 0.4mm Hardened Steel Nozzle 2 x 0.4mm Brass 3 Hole CHT Nozzles 2 x 0.4mm Hardened Steel 3Hole CHT Nozzles Size: Approx. M6 x 18mm / 0.71in, edge width 6mm / 0.24in. 2 x 0.4mm Brass Nozzles 2 x 0.4mm Hardened Steel Nozzle 2 x 0.4mm Brass 3 Hole CHT Nozzles 2 x 0.4mm Hardened Steel 3Hole CHT Nozzles