The Genuine HP 27X Toner Cartridge C4127X is specifically designed for use with HP LaserJet 4000 and 4050 series printers. As an original HP product, it ensures high-quality printouts with its laser print technology. With a unit quantity of 1, this black toner cartridge is compatible with various HP printer models, providing reliable performance for high-volume printing needs. Perfect for professionals looking for consistent and professional results, this genuine HP toner cartridge is a cost-effective choice for achieving exceptional print quality.