These are hardened steel dual drive gears for a 3D printer extruder.
The gears are made of hardened steel, with a hardness of 55HRC after heat treatment.
They feature nickel plating to prevent rusting and increase longevity.
The design includes curved teeth for better grip and a stable driving force on the filament.
They are compatible with various 3D printer extruders, including the Creality K1 series and Bondtech systems.