We ordered one of these kits and I was very impressed with how complete it is. For whatever reason, this is not entirely clear on the link so I'll include some pics. http://www.reprapdiscount.com/hotends/67-hexagon-hotend-set.html Included: Hot end cooling fan and active cooling fan. Thermistor pre-wired and terminated with a locking plug. Pre-terminated extension cable for thermistor. Rubber retainer. Heating element. Two grub screws and two hex wrenches. Aluminum mounting bracket. Completely assembled metal parts, to include the nozzle pre-installed. Wrench for nozzle.