The 8mm ball bearings are essential components for the maintenance and repair of your Airsoft AEG. They provide a precise and durable solution to ensure the smooth rotation of gearbox components. These ball bearings are compatible with AEGs that use 8mm gears and improve the overall performance and lifespan of the gearbox. Note that these ball bearings do not offer a direct performance boost but serve as a replacement for worn-out or damaged parts.