934 and 935 ink cartridges compatible with HP printers: OfficeJet 6812 6815 OfficeJet Pro 6230 6830 6835 The following Compatible Cartridges are Included: 1 C2P24AN HP 935XL Cyan 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.