The Office Depot Model 56 Black Ink Cartridge is supposed to be a replacement for the HP 56 cartridge. It's not good. It worked for a very short time and then all of the sudden it couldn't be recognized by the printer anymore. I took it back to Office Depot and they refunded my money and let me upgrade to the HP 56 cartridge for the difference of the cost between the two, which was $3.25. Save yourself the trip and buy the HP 56 from the start.