Designed from scratch by the manufacturer of your printer, there is no better choice for your Hewlett Packard laser printer than the genuine HP 56X black toner cartridge. As an original Hewlett Packard toner cartridge the CF256X gives a quality of print unobtainable by any alternate products and is worth every penny.The running cost of all compatible Hewlett Packard mono laser printers is mercifully low with the HP 56X thanks to the high 13,700 page yield of the black toner cartridge. You are guaranteed compatibility between the Hewlett Packard CF256X and any laser printer mentioned on this page (including the LaserJet MFP M436n), so you can rest assured with one of these units in hand.