IKONG Compatible Ink Cartridge Replacement for 934xl 935xl Ink Cartridges(New Updated Chips) works with Officejet Pro 6830 6835 6230 6812 6815 6820 6220 Printers Contents: HP 934XL 935XL Compatible Ink Cartridge Replacement HP 934 935 (6 Black,2 Cyan, 2 Magenta, 2 Yellow--Total 12 pack) Upgrade Firmware Support for 934 ink: Click "IKONG" below the price,then enter "Ask a question" on the Top right to the next page to contact us,with any damaged cartridge emails replied in less than 24 hours 7/7. Printer Capacity for HP 934XL: HP Officejet Pro 6830 6230 6835 6812 6815 6820 6220 Printers Ultra-high Capacity:"934 935 XL" High Yield ink cartridges enjoy your $AVING$.(50% cheaper than the brand ) Get brilliant readability and vivid color vibrancy for projects and everyday prints. IKONG-Smart Technology: hp 934xl hp 935xl Ink remaining levels accurately reported for compatible printers-same as OEM capability. One-year limited warranty.