1、APPLICABLE MODEL: The extruder is suitable for ET4, ET4PRO, ET5, ET5PRO 3D printer, possess small size, compact structure, simple and quick assembly, good compatibility 2、APPLICABLE MATERIALS: 3D printer extruder support a variety of 1.75mm printing wires, such as PLA and ABS, for a wide range of applications, very versatile 3、WITH STEPPER MOTOR: The extruder adopt a 42 step motor design, and the shaft speed is fast, ensuring the efficient and safe operation of the 3D printer 4、WITH NOZZLE AND HEATER: The 3D printer extruder head kit come with a standard 0.4mm nozzle, 24V 40W heater and is approximately 1.5 meters, that is 4.9 feet long, to ensure accurate printing 5、STRONG METAL: Extruder is made of excellent metal material, possess high hardness, wear resistance, no deformation, and long service life, you can use with confidence