HP 761 400ml Dark Grey DesignJet Ink Cartridge. OEM: CM996A. With a large page and character yield, this original DeskJet cartridge provides both value for money and the quality you expect from HP. HP are the world leaders in printing innovation, holding hundreds of patents in ink chemistry and rolling out over 100 new inks in the last two decades. Formulated to deliver rich, colour intense images this thermal inkjet cartridge guarantees professional quality results from the first page to the last.