These Extruder Head Kit Suitable for 3. Tip of the nozzle, aluminum heating block, throat pipe (built-in PTFE) MK8 Extruder Hot End Kit, white wire was temperature thermistor, Black wire was heating tube 12V 40W Installation type: External thread connection Nozzle size: 0.4mm Cable length: 1.2m Heating Tube: 24V 40W Operating temperature range: -40~+260°C (-40~+500°F) Material: Brass Color: red + gold Throat length: 52mm Aluminum block size: 20 x 20 x 10mm Package contents:5 x Aluminum Block 5 x Heating Tube 5 x M6 x 30mm Throat Pipe (Built-in PTFE) 5 x Thermistor +Brass Sleeve 25 x 1.75mm 0.4mm Brass Nozzle 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.