1Application: For Sherpa Mini extruders, for VORON 0 0.1 0.2 series or wherever this gear set can be used. If you are skilled in mechanical design, you can also incorporate it into your extruder design. 2High Concentricity: The one piece shaft design ensures better concentricity of the gear and reduces the eccentricity of the gear due to the assembly, which makes the gear delivers the filaments more evenly. 3High Torsion: Extruder gear, CNC hollow POM gear, reduction gear design, high transmission rate to achieve higher extrusion torsion. High strength mould steel material and nano coating for surface treatment, more durable. 4Hard And Wearable: The overall gear HRC hardness value up to 6265; HV surface hardness value up to 10001200, which greatly ensures the gear's strength, abrasion resistance and rust resistance. 5Ball Bearings: The driven gear adopts double ball bearings instead of the original needle roller bearings, with smaller backlash and higher accuracy. Can be used to upgrade your 3D printer extruder.