Features:Tip of the nozzle, aluminum heating blockMK8 extruder hot end kit, white wire was temperature thermistor, red wire was heating tube 12V40W.Specifications:Material: Aluminum & Stainless Steel & BrassScope of application: 3D printerNozzle size: 0.4mmAluminum block size: 20 mm x 20 mm x 10 mmOperating temperature range: -40°C to +260°C (-40°F to +500 °F)Thermistor and heater cable length: 1MPackage includes:1 x Aluminum Block1 x Heating Tube1 x Thermistor5 x 0.4MM Brass Nozzle