Features: This MK8 assembled extruder hot end kit is compatible with Ender 3/Ender 3 Pro 3D printer. White wire with pin head is temperature thermistor, red wire is heating tube 24V 40W. With 0.4mm Nozzle, Aluminum Heat Block, Thermistor with Pin Head, Throat Pipe and so on, fully assembled, easy to install. Main material is aluminum, stainless steel and brass, premium and durable.