Makerb \/ Reprap 3D Printer Extruder Head For MK8 Upgrade Version  Specification:  Toal weight: 471g Size: 90 x 76 x 76mm  MK8 inner contain:<br> 1 x 24V fan 1 x Anode black aluminum fan hot slice 1 x Stainless steel feed head 1 x Stainless steel bearing 1 x Stainless steel squeeze into the head 1 x Fixed anode black aluminum piece 1 x Electrical machine 1 x Heated aluminum block 1 x 0.36mm brass nozzle 1 x Thermocouple  Package included:  1 x Extruder head