Genuine OEM HP DesignJet Z3100 ps 24 In. Ink and Supplies
HP 70 supplies for the 24-inch DesignJet Z3100ps include gray ink, gloss enhancer, and a separate gray/gloss enhancer printhead. Those names describe different purchases. The paired printhead puts the two supplies on paper; it isn't a package containing their ink cartridges.
Toner Buzz carries genuine HP 70 individual inks and paired printheads for this printer. Choose the named ink for a top-up, keeping gray and light gray distinct. For printhead work, select the matching pair, such as matte black/red or gray/gloss enhancer, rather than an ink cartridge.