PTFE tubing with lowest friction on the market. Less friction means more responsiveness, less retraction, more accurate prints, less slippage, wear, and tear on the extruder, and less clogging when printing chunky filaments such as some woodfills or ironfills. Pluggable: the heating tube and temperature thermistor that from control box, connect them with terminal housing and pin. Then you could plug the hotend kit, easier to replace hotend kit. With more terminal housing and pins as spare parts, in case fail installation and waste. MK8 Extruder Hot End kit, white wire was temperature thermistor, braided wire was heating tube 24V40W. Specification: Style:Hotend Kit Installation type: external thread connection perating temperature range: -40 ~ +260 Celsius(-40 ~ +500 Fahrenheit) Colour:Black + red + gold Material:Aluminum + brass + stainless steel Package Contents: 2 * Hot End Kit(Concluded PTFE tube) 6 * 0.4mm Nozzle 6 * Silicone Cover 4 Pair * Large and Small Pneumatic Couplers Please noted that the pins is clamped with long nose pliers. 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.