The Wexford 61 Black Ink Cartridge 2-Pack is compatible with HP DeskJet, ENVY, and OfficeJet printers. This standard ink cartridge is designed for inkjet print technology and comes in a unit quantity of 1. Specifically made for HP OfficeJet model 3910, this black ink cartridge is a reliable choice for printing high-quality documents and images. With a brand known for quality and compatibility, this product is an essential supply for any home or office printer setup.