Speedy Inks - Remanufactured Replacement Set for HP 711 (4PK): CZ130A Cyan, CZ131A Magenta, CZ132A Yellow, CZ133A Black Ink Cartridge Set For use in HP: DesignJet T120, & DesignJet T520 Shelf Life: 12- 18 Months This professionally remanufactured cartridge for HP 711 has a 'smart chip' that makes continuous adjustments to optimize print quality and enhance reliability and cost effectiveness as well as monitor ink levels. The use of aftermarket replacement cartridges and supplies does not void your printer's warranty