This HP 304 is a genuine Hewlett Packard tri-colour ink cartridge that comes filled with enough cyan, magenta and yellow ink to provide users with an estimated 100 prints. As an original Hewlett Packard product, the N9K05AE is of the highest possible quality and comes straight from the manufacturer.Containing its very own printhead, ink comes directly from the HP 304 to your paper. Although this makes the N9K05AE cartridge more expensive per page than the individual colour cartridges from other cartridge ranges, it reduces the mechanical wear and tear of your inkjet printer and makes permanent blockages within the machine an impossibility.Our original N9K05AE cartridges for the HP Deskjet 3720 (and all other compatible HP printers) are amongst the lowest priced on the Internet and carry a 100% satisfaction guarantee. All our prices include VAT and delivery so the price you see is the price you pay.