With this HP Pagewide or HP Pagewide Pro cartridges, you can replace the ink of your Pagewide or Pagewide Pro printer. You can refill your printer with the HP 973X cartridges or the HP 913A cartridges. Which ink cartridges you use depends on your printer model. Each cartridge has a unique size and it doesn't fit in every printer. So first check which printer series you have, so you'll always buy the right cartridges. You can find the model of your printer in the manual.