Premium Quality: MK8 nozzles are constructed from hardened tool steel, offering excellent wear resistance, heat resistance, good corrosion resistance, and high strength for a long lifespan. They are easy to install and replace. Great Performance: The hardened tool steel nozzle boasts high toughness and hardness, suitable for 1.75mm high-temperature 3D printer filaments like carbon fiber and fiberglass. High Precision: With a diameter error of less than 0.02mm, the 0.4mm 3D printer nozzle effectively prevents print head leakage and produces consistent prints with a smooth, glossy finish. Its rounded chamfer reduces corner resistance and prevents filament blockage. Compatibility: MK8 extruder nozzles are compatible with Makerbot CR-10, Ender-2 / Ender-3 / Ender-3 pro / Ender-5, Anet A8, Reprap, Prusa I3, and other common 3D printers. Package Includes: The set includes 5 MK8 nozzles with a 0.4mm outlet diameter and a 1.75mm inlet diameter.