934 and 935 ink cartridges compatible with HP printers: OfficeJet 6812 6815 OfficeJet Pro 6230 6830 6835 Package Includes: 9 pack of HP ink 934xl 935xl combo 3 Black 934XL C2P23AN, 2 935XL Cyan C2P24AN, 2 935XL Magenta C2P25AN, and 2 935XL Yellow C2P26AN inkjet cartridges Compatible *Per Cartridge at 5% coverage (ISO/IEC standard) All LD branded remanufactured HP 934XL 935xl compatible ink cartridges for HP printers contain a smart chip for monitoring your ink levels and may contain new and used parts Please contact us first with any product issues. We want all of our customers to be happy because happiness matters.