Hp 727 300-Ml Gray Designjet Ink Cartridge Sold as 1 Each. Make an impression with clear, easily readable drawings and colorful, powerful presentations. With Original HP inks, you get crisp, clear, accurate lines and vivid color--even true neutral grays. See accurate, professional results, print after print, cartridge after cartridge with Original HP inks. Intelligence built into Original HP ink cartridges and printer continuously optimizes quality, reliability.