1 x Genuine wanhao replacement pair of MK10 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 or even an upgrade for those fitted with the Mk9 version. The Mk10 has improved larger head nozzles, spanner adjustable threaded guide tubes for easy leveling and also newer sturdier mounts. Simply plug in and off you go, refresh your duplicator today