HP 91 Photo Black and Light Gray Printhead (C9463A) HP's innovative printhead design places ink drops with precise accuracy. You get vivid color and smooth, neutral grays. You get clear, crisp lines and text. And you get consistent results even at fast print speeds HP printheads are designed and tested with HP Vivera pigment inks and the printer to provide consistent results across a wide range of media Original HP printheads contain built-in intelligence designed to continuously optimize print quality and maximize printhead life. With consistent results, less intervention is required, so you can be more productive For Hewlett Packard DesignJet Z6100