myCartridge 2 Pack Compatible HP 934 934XL High Yield C2P23AN Black Ink Cartridges With Update Chips Compatible Replacement for HP 934XL C2P23AN (2 Black) 2 Pack Page Yield: 1300 pages per cartridge (5% coverage) ISO9001 and CE Certified Cartridges SHOW ACCURATE ink levels! Compatible with Officejet Pro 6230 6835 6830 HP Officejet 6220 6820 6815 6810 6812