HP 728 - 300 ml - matte black - original - DesignJet - ink cartridge - for DesignJet T730, T830. Facilitate communication and collaboration with quality prints from clear, easily readable drawings to colorful presentatins. To help reduce downtime and improve productivity-and protect your investment-Original HP inks are designed with your HP DesignJet printer or MFP as an optimized printing system. Choose from a range of cartridge sizes from 40 to 300 ml. Take advantage of free, convenient ink cartridge return and recycling.