Keep black-only and mixed-color large-format output moving with the HP 738 Black DesignJet Ink Cartridge. This OEM supply is built for HP DesignJet printers that need consistent black density, clean line work, and dependable throughput across professional print jobs. The 300 mL capacity helps reduce cartridge swaps, which is valuable when operators are managing deadlines, not maintenance windows. For technical drawings, maps, presentation graphics, and production prints, black ink carries more than text. It defines edges, improves contrast, and anchors detail. Using an original HP cartridge helps maintain the print system’s intended behavior and supports repeatable results across long runs. This cartridge fits environments where output quality and operational efficiency directly affect cost. It is a practical choice for teams that need reliable supply performance without compromising the standards expected from HP DesignJet systems.