Plug and Play: Remove the old extruder and install the new hot end to start. (3D accessories are pre-installed) Nozzle and heating block: The seamless connection between the nozzle and the heat break accelerates the nozzle to dissipate heat, and the heat break to insulate, which frees the nozzle blockage. Please note that there is a slight color difference or deviation in kind, it does not affect the use, please don't mind, thank you! Note: This hotend kit is only compatible with for Neptune 4 3D printers. Color: As shown Material: Aluminum + Brass Package Contents: 1 x Printing Pickup Nozzle Nozzle Kit 1 x Nozzle 0.4mm Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. With the concept of customer first, we provide you with 24/7 customer service. No matter where you are or what problems you encounter, we will solve them for you as soon as possible to ensure that your shopping experience is worry-free.{xjxj}