Micro Swiss High Lubricity Wear Resistant Nozzle Upgrade MK10 0.4 mm (2 pcs) - for Flashforge Dremel PowerSpec Wanhao with M7 Threads Compatible replacements for use on MK10 type hot-ends with a M7-threaded heater block Extra low friction for smooth plastic flow Very good release properties (eliminate clogging) Corrosion resistant Made in USA