MIROO Ink With Updated Version Chips 1Set+1BK High Yield Replacement for hp 934xl 935 ink Cartridge Compatible with HP OfficeJet 6812 6815 Officejet Pro 6230 6830 6835 Printers Package Includes: 2xBlack, 1xCyan, 1xMagenta, 1xYellow . Compatible With HP Officejet Pro 6230 6830 6815 6812 6835 6836 All-in-one Printer. Reliable performance Good quality High Capacity Save cost ,page yeild:1,000pages/Black and 825pages/Color. ISO-9001 and CE certificate and 1-year warranty service. Before installing the ink , please make the cartridge upside down, then take off the orange cover, and rip off the yellow tape.Please wear gloves prevent do not to get the ink on your hand .