Axiom (TM) 4pk HP 21 22 Ink Cartridge Officejet 4315 J3680 Printer 4 Pack HP 21/HP 22 Remanufactured Cartridge Works with ALL HP printers that use 21/22 ink cartridge Black: 2 HP 21 Black C9351AN ink cartridges & Tri- Color: 2 HP 22 Tri-Color C9352AN ink cartridges Black: Yields 150 pages per cartridge Tri-color: Yields 138 pages per color