New Fuzion - Brother TN770 Toner Cartridge (Extra High Yield Compatible). If you are tired of aftermarket toner cartridges that provide poor printing then it's time to switch to Fuzion!. This item is chipped so does not require you to switch out any chips. Plug it in your drum unit and you are good to go! It will provide up to 4,500 high quality prints from each cartridge.