Speedy InksNew 2016 3G Chip Remanufactured Replacement for HP 934XL & 935XL Set of 4 Cartridges C2P23AN Bk C2P24AN Cy C2P25AN Mag C2P26AN Yel 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