Brother supplies are specially designed for the unique print mechanism that each machine uses. For optimum performance use a genuine Brother branded cartridge, specially formulated to ensure top print quality. Printing with any 3rd party consumable may reduce not only the print quality but also the quality and life of the printer. If damage is caused to the drum unit or other parts of the machine as a result of using non Brother branded products. any repairs required as a result may not be covered by the warranty.