HP 51644M. No 44. Inkjet Print Cartridge Magenta 42ml. For Designjet 350C/430/450C/ 455CA/488CA/750C/750C+/ 755CM. 840 page life. The 44 cartridge has been rigorously tested with Designjet 400 and 700 series printers for detailed, colourful photo and document printing. It's specifically designed for high-definition graphics used by architects, cartographers and graphic artists. This cartridge is packed with enough magenta ink to print up to 840 pages.