The original extruder gear are made of stainless steel, if you print tough engineering filaments like carbon fiber nylon and glass fiber nylon, than it will get abrasion,so in this case, we suggest you to use this handen steel one.
Both gears are made of handen steel , and plate nickel, which can prevent from rusting so that it can work for long time.
The hardened steel extruder gear assembly is an internal component of the hardened steel extruder unit. It comprises a driven gear and an active gear that work together to feed filament into the hotend.
Built with heavy-duty materials, the extruder gear assembly is designed for long-lasting performance. However, if abrasion or clogging occurs due to extended use, the extruder gear assembly can be easily replaced.