Product Details Fangrui Product Details Integrated Axle Design - Improve Concentricity,reduce Gear Eccentricity. Extended Gear Life - The Overall Hardness (hrc) Of 62-65 And Hardness(hv) Of 1000-1200. Gear Materia - Constructed From High-strength Mold Steel With A Nano-coating Treatment. Consistent Extrusion - Solve The Common Problems Of Extruder Inconsistency And Poor Filament Grip, Ensuring Smoother, More Reliable Printing Performance. Precision Bearings - Double Ball Bearings Can Reduce The And Improve The Feeding Accuracy Of The Extruder. Nanocoated Mold Steel Integrated Extruder Gear For Neptune 4. Use One Shaft Design Higher Gear Ratio Nano-coating Treatment Concentricity Is Better Greater Extrusion Force Colour:black Material:metal Package Contents: 1 * 3d Printer Extruder Gear Only The Above Package Content, Other Products Are Not Included. Note: Light Reflection And Different Displays May Cause The Color Of The Item In The Picture A Little Different From The Real Thing. The Measurement Allowed Error Is +/- 1-3cm.