Original HP 91 Printhead Cartridge provides speedy, consistent printing that yields realistic, vibrant results. Innovative design places ink drops with precise accuracy to provide impressive results in a range of vibrant colors, smooth transitions, crisp text and fine lines. Built-in intelligence continuously optimizes print quality while maximizing printhead life. Cartridge lets you work more quickly and efficiently to get more professional results in less time. HP 91 Printhead Cartridge is designed for use with Hewlett-Packard Designjet Z6100 Series.