HP 564 ink cartridges work with: HP DeskJet 3520, 3521, 3522, 3526. HP officejet 4610, 4620, 4622. HP Photosmart: 5510, 5512, 5514, 5515, 5520, 5525, 6510, 6512, 6515, 6520, 6525, 7510, 7515, 7520, 7525, B8550, C6340, C6350, D7560, C510, B209, B210, C309, C310, C410, C510. Savings up to 5% with HP 4-packs.