Features: One-pieced ensures better concentricity of the gears, reduces eccentric rotation of the gears due to assembly, and ensures more even delivery of filaments by the gears. Helical gear design for better meshing, smoother gearing and more lineared force transfer. Large transmission overlaps, long meshing time and large contact area reduce the stress, thus improving the gear's load-bearing capacity and prolonging its service life. High-strength mold steel used extruder gear, and coating is used for treatments. The overall hardness value of the gear reaches 62-65; the hardness HV value reaches 1000-1200, which greatly ensures the strength, abrasion resistance and corrosion resistance of the gear, improves the gear's load-bearing capacity and extends the service life of the gear. Specifications: Name: Extrusion Head Gear Applicable Models: For 5M Printer Material: Mold Steel Size:about 24.5x25.8mm/0.96x1.02in Package Includes: 1Set Extrusion Head Gear note: Please allow 1-3mm error due to manual measurement.Please make sure do not mind before bid. The color may have different as the differences display,please understand.