This HP C4127X 27X Black Toner Cartridge is a genuine and original product, which comes in a sealed box. It is compatible with HP LaserJet printers, including 4000, 4000n, 4000se, 4000t, 4000tn, 4050, 4050 USBMac, 4050n, 4050se, 4050t, 4050tn. The print technology used in this cartridge is laser, and it produces high-quality black and white prints. The cartridge is suitable for use in home or office settings, and it is easy to install and use.