Hello Original black ink from HP 15 (C6615D), designed to provide clear, high-quality black text for compatible printers. Capacity and Yield: Contains 25 ml of ink and is sufficient for printing approximately 500 to 600 pages, depending on usage. Compatible Printers: Works with several older HP printers such as the HP DeskJet 840c, 920c, 940c, 3820 series, and others. Quantity: 21 new cartridges. For sale to the highest bidder.