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. Designed for use with Hewlett-Packard Designjet Z6100 Series.