High-quality material: Made of hardened tool steel, it has good wear resistance, heat resistance and corrosion resistance. The nozzle has an overall hardness of 50 HRC and a surface hardness of 55-60 HRC, which has a long service life. High temperature resistant: The nozzle can withstand temperatures up to 450 degrees and suitable for high temperature 3D printing, not only for common 1.75mm 3D printer filaments, but also for printing PLA, ABS carbon fiber and even PEEK filaments. Wide Compatibility: Works with almost all FDM printers and can be mounted on a mk8 heater block. These nozzles are compatible with the mk8 hotends of e3d v5 / V6 and Ender 2 3S 3 pro, but also with the hotends of Cr - 10 all Metal, prusa I3, Anet A8, reprap, etc. High precision: the inner wall of the 0.4mm diameter nozzle is smooth and burr-free, with a low viscosity coefficient. Maintain a stable temperature during printing to allow the Filament to come out evenly. What you get: the package comes with 5