Unlock the freedom to print with this set of 2 empty refillable ink cartridges compatible with HP564 and HP564XL models. Designed for seamless integration with HP Photosmart 5510, 5511, 5512, 5514, 5515, 5520, 5522, 5525, 6510, 6512, 6515, 6520, DeskJet 3520, 3522, and Officejet 4620 printers, these cartridges offer a cost-effective solution for all your printing needs. With their user-friendly refilling system, you can easily replenish the ink supply, reducing waste and saving money in the long run. Enjoy crisp, vibrant prints for your documents, photos, and creative projects with this reliable and convenient cartridge set. Instructions included Our American made " Ultra Pro True Color Ink " prints roll to roll or sheet to sheet with a consistent color match. Our quality control techniques including surface tension, viscosity, pH, conductivity, specific gravity, and color match by spectrophotometer. We test new ink in real-time test modes. Our compatible inks are rigorously tested to meet and exceed the highest customer expectations by means of ISO 24711 and other print performance criteria. LEGAL NOTICE Epson, Brother, Canon, HP, Sawgrass, and other manufacturer brand names and logos are registered trademarks of their respective owners who have no association with or make any endorsement of the products or services provided by inkproducts.com Any use of a brand name or model designation for a non-OEM cartridge or product is made solely for purposes of demonstrating compatibility. Inkproducts.com makes no claim of affiliation, endorsement, or sponsorship of any of its products or services (including this site and all products and services referred to on this site) by any other company or person.