What's in the Box? This pack of ink cartridges includes 3 black and 2 tri-color cartridge replacement for 15 and 17. What models of printer compatible with? DeskJet 841 (C8936A) DeskJet 842 Product advantage: Reliable compatibility Easy installation Clear quality printing High resolution and colorful Applicable scene: Hospitals Schools Government Trading companie Finance companies and more scenarios. High capacity: The ink cartridge filling capacity is large, the utilization rate is high, the ink capacity is sufficient, and the printing is fluent. High-quality Printing Effect: The 15 and 17 ink cartridge is a durable and high quality ink cartridge. It is compatible with a range of printers and provides a high quality print,because it's cleaner, sharper and more vibrant. Description of products: Cartridges come filled with chip, show accurate ink levels, and work with all printers. These cartridges do not void the printer's warranty.Cartridges are ISO 9002 certified for print quality, and ISO 14001 for environmental assurance. If you have any after-sales problem, we will provide you with a satisfactory solution(Including free replacement or return). Thank you for your purchase and wish you a happy life!