Speedy Inks Remanufactured Ink Cartridge Replacement for HP 950/ HP 951 High-Yield (3 Black, 1 Cyan, 1 Magenta, 1 Yellow, 6-Pack) one year guarantee For use in Hewlett Packard: OfficeJet Pro 251dw, OfficeJet Pro 276dw MFP, OfficeJet Pro 8100, OfficeJet Pro 8600, OfficeJet Pro 8600 Plus, OfficeJet Pro 8600 Premium, OfficeJet Pro 8610, OfficeJet Pro 8620 and OfficeJet Pro 8630 Page Yield: Black: *2300 | Color: *1500 | *Average cartridge page yield in accordance with ISO IEC 24715 | Shelf Life: 12-18 Months This professionally remanufactured cartridge also 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