Speedy Inks Compatible Ink Cartridge Replacement for HP 934XL  ( Black, Cyan, Yellow, Magenta , 12 pk ) For use in OfficeJet 6812, OfficeJet 6815, OfficeJet Pro 6230, OfficeJet Pro 6830, & OfficeJet Pro 6835 Page Yield: Colors 1,000* | *Average cartridge page yield in accordance with ISO IEC 24711 Shelf Life: 12- 18 Months Our remanufactured ink cartridges are not remanufactured by HP. The use of aftermarket replacement cartridges and supplies does not void your printer's warranty