1APPLICABLE MODEL: 3D printer nozzle kit is consist of 10 hardened steel nozzles with high flow rate and high temperature resistance for Elegoo Neptune 4 and for Neptune 4 Pro 2HIGH FLOW RATE: Hardened steel nozzles has a thermal conductivity of 300W/mk, which is heated uniformly, and is twice the volume of ordinary nozzles, supporting a printing speed of 600mm/s 3SUITABLE MATERIALS: 3D printer nozzles are suitable for most FDM materials, such as PLA, ABS, PETG, TPE, TPU, PC, etc., as well as PEEK, PEKK, PEI, PSU, PPSU and other high temperature filaments 4EXCELLENT MATERIAL HANDLING: Extruder nozzles ensure rapid heating and continuous printing of high temperature wire, stainless steel can withstand high temperatures up to 500 5HIGH TEMPERATURE RESISTANCE AND GOOD THERMAL CONDUCTIVITY: The inner wall roughness of hardened steel nozzles is Ra<0.4, which reduce blockage, resistant to high temperature, conduct heat quickly, and is more stable in printing 6SMOOTH EXTRUSION: Metal hot ends nozzle is smooth, burrless inner wall enhance the flow of consumables, has a low viscosity coefficient, not easy to plug, and bring more smooth extrusion