HP C9463A no 91 printheads photo black/light grey. For use with Designjet Z6100. HP created the No.91 Series of printer supplies to ensure that you have everything that you need in order to achieve high quality, defined printing. Working with your printer without fuss or hassle you don't have to worry about mistakes in the printing or delayed print times. The subtle range of shades achieved by each cartridge ensures that even shaded images are printed with sharp definition.