HP 728 Matte Black 300 ml. DesignJet Ink Cartridge delivers easy-to-get, crisp, clear results. Designed together with your HP DesignJet T730 Printer and HP DesignJet T830 Multifunction Printer as an optimized printing system, Original HP inks can help reduce downtime and improve productivity. High-capacity, 300 ml. ink cartridges enable more unattended printing. See accurate, professional results, print after print, cartridge after cartridge. Intelligence built into Original HP ink cartridges and printer continuously optimizes quality and reliability. Original HP inks enable fast print speeds and produce smudge-resistant prints.