One-piece shaft design ensures better concentricity of the gears, reduces eccentric rotation of the gears due to assembly, and guarantees more even filament delivery. CNC hollow stainless steel gears, reduction gear design, high transmission ratio, to achieve greater extrusion torque, more wear-resistant. The driven gear adopts double ball bearings instead of the original needle bearings, with smaller clearance and higher precision. Selection of high-strength mold steel as the material of the feed gear, the use of nano-coating surface treatment process, the Rockwell hardness of the gear as a whole HRC value of 62-65; the surface hardness HV value of 1,000-1,200 greatly ensures the strength of the gear, abrasion resistance and corrosion resistance. Lightweight design, to ensure the strength of the gear itself under the circumstances of the gear hollow gear excess material, reduce the weight of the gear. Colour:Silver & Black Material:Stainless steel Due to different batches, there may be differences in product appearance and printed text, which will not affect use Package Contents: 1 * Extruder Gears kit 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.