Best CISS For HP Officejet Pro 8122e, 8135e, 8138e, 8139e Printers That Use The 923 Cartridges Guaranteed to Work! For HP Officejet Pro 8122e, 8135e, 8138e, 8139e Printers That Use The 923 Cartridges The system is pre-filled with 450 ml of our Ultra Pro True Color Pigment ink. (OEM Quality) Will not clog the print head! Equal to 20 sets of HP XL 923 cartridges. The system comes with a new set of HP XL 923 cartridges installed This CIS ink system is capable of printing thousands of pages! Newly designed isobaric air chamber to balance the proper air and ink supply to the printhead New Rocket Bottle Design American Made Ink! Our ink gives you the superior image quality you need and provides light resistance and exceptional quality and durability. Ink system will protect the ink from dust and light. Ink levels will not show full but that is not needed when using our ink tank system because it will supply unlimited ink. Save hundreds of dollars! Simple Very Easy To Install 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.