KOYOFEI Hotend Kit for Elegoo Neptune 4/4 Pro 3D Printer with 5PCS 0.4mm BrassA complete hotend assembly designed for Elegoo Neptune 4 and Neptune 4 Pro 3D printers. The throat tube uses copper-titanium bi-metal construction to withstand temperatures up to 300°C while supporting print speeds of 500mm/s. This kit includes one silicone sock and five extra 0.4mm brass nozzles, giving you multiple spares for continued printing. The heating block comes pre-installed with thermistor and heating rod for straightforward replacement.MPNKYF-3D-293Itemweight0.13 poundsProductdimensions1.3 x 0.8 x 5.8 inchesStyleNeptune 4PartnumberKYF-3D-293