These 0.4mm nozzles are genuine factory nozzles for Flashforge older style MK9 3D Printers. They can also be used on other 3d printers using an M6 threaded heater block using a 3mm OD PTFE Tubing inside the nozzle.
NOT suitable for newer style Flashforge printers with the wider Mk10 nozzles found on newer Creator, Creator X and Dreamer 3D printers.
Compatible with 3D Printers using MK9 Extruders including-
Nozzle size 0.4mm
Internal Diameter: 3mm
Spanner size: 7mm
Total Length: 13mm
Head length: 8mm