The HP 903 Black Ink Cartridge produces reliable professional-quality documents at a great value. The resulting crisp black text dries instantly and resists water and smears.A 903 Black Ink Cartridge yields about 300 pages and is compatible with HP OfficeJet 6950 All-in-One, HP OfficeJet Pro 6960 All-in-One and HP OfficeJet Pro 6970 All-in-One printers.HP Instant InkSave up to 70% on ink with HP's Instant Ink service. When your printer is running low, it automatically orders more ink cartridges, so you don't have to order them yourself.The service works on how many pages you print, not how much ink you use. You can choose from a range of monthly page plans, and unused pages roll over to the next month. The price includes ink, shipping and cartridge recycling.