Designed piece by piece to work perfectly with the HP Colour LaserJet Pro MFP M277n and many other printers, the genuine HP 201X twin pack is one of the very best choices for your printer. The black toner powder contained within the Hewlett Packard CF400XD cartridges gives an exceptional quality of print, producing anything from the darkest of blacks to the most subtle of shading.Each original HP 201X toner cartridges give an estimated 2,800 prints before it will need changing, making your monochromatic laser printer refreshingly cheap to run. This black toner cartridges comes fully guaranteed by Hewlett Packard, in the rare instance a technical issue occurs.