Genuine Canon drum units, like the black C-EXV28, guarantee the smooth running of your imageRUNNER Advance laser printer for an amazing amount of prints. With an estimated 171,000 page yield, the Canon 2776B003BA is a component that does not need changing often, but is absolutely essential to your printer. Imaging drums like the Canon 2776B003BA handle all of the powder from your installed toner cartridge/cartridges and apply it to paper efficiently. Whilst you may not think of the C-EXV28 black drum unit all that often, getting the quality of print you expect from your Canon IRC5051 (and all other compatible printers) depends upon this consumable.