This twinpack of HP 62 (N9J71AE) cartridges contains one black and one tri-colour cartridge. It is the cheapest way to get several HP printers (including the excellent HP Envy 5642 e-All-in-One) up and running with genuine ink. The black cartridge (C2P04AE) contains 4ml of high quality pigment-based black ink and the colour (C2P06AE) contains dye-based cyan, magenta and yellow ink totaling 4.5ml. Ink comes directly from these cartridge s onto your printer paper making installation and the occasional bit of maintenance quick and easy.