1 x Genuine wanhao replacement pair of MK9 extruders supplied with fans, nozzles and thermocouples etc. The whole hot end is provided along with the full wiring loom and connections for the Duplicator 4. A simple plug in replacement for all duplicator 4 printers. Now comes fitted with the very latest MK9 extruder feeder mechanism for the ultimate dual extruder package. Simply plug in and off you go, refresh your duplicator today