Ideal for HP DesignJet graphics printer owners who want to maintain cost per copy and gain peace of mind. Stay ready to respond quickly to customers-and gain cost savings. HP 91 value packs feature 10% savings[1] on a printhead and two 775-ml HP ink cartridges with Original HP Vivid Photo Inks. Rely on HP supplies for optimal results.Compatible Printers: HP DesignJet Z 6100 PS 60 Inch, HP DesignJet Z 6100 PS 42 Inch, HP DesignJet Z 6100 Series, HP DesignJet Z 6100 60 Inch, HP DesignJet Z 6100 42 Inch