Keep your HP DesignJet or DeskJet printer producing crisp, professional output with the genuine HP 40 black ink cartridge. Formulated with pigment-based ink, it delivers dense, waterfast, fade-resistant text and graphics with a page yield of up to 1,100 pages. The clog-free formula ensures consistent print quality throughout the cartridge's life, while a visible ink-level indicator lets you know exactly when a replacement is needed. Purpose-designed to work alongside HP's 51640C/M/Y colour cartridges, it's compatible with a wide range of DesignJet and DeskJet printers, making it a reliable choice for offices and studios handling regular document or graphic printing.