HP 51644C. No 44. Inkjet Print Cartridge Cyan 42ml. For Designjet 350C/430/450C/ 455CA/488CA/750C/750C+/ 755CM. 840 page life. Giving you an excellent level of precision and quality, Hewlett Packard Inkjet Cartridges are perfect for home and office use. Whatever you are trying to print ? text, images or graphics ? you never have to worry about clarity or definition. Hewlett Packard specifically designs its inks to prevent the unwanted mixing of colours, preventing murkiness and colour bleed. This keeps colours vibrant and true to real life, adding an extra layer of quality to prints.