The highest capacity matte black offered for the large format HP printers listed below, the CN635A lowers the cost per page of your machine substantially. The 300ml of matte black ink contained within the Hewlett Packard CN635A makes it a very economically viable purchase.Containing incredibly high quality pigment-based matte black ink, produced by Hewlett Packard themselves, the CN635A gives results that you can be proud of. The CN635A and every colour in the HP 772 range are the premium choice for those that need the very best from their inkjet printers.