This is a genuine HP 42A Black Original LaserJet Toner Cartridge that is compatible with HP LaserJet 4240, 4250 and 4350 Printer series. This high-quality toner cartridge is designed to produce sharp, clear and accurate text and images in black color. It has a yield of approximately 10,000 pages and is perfect for use in home, office or commercial printing. The HP 42A Black Original LaserJet Toner Cartridge is made with the highest quality materials and is designed to work seamlessly with your printer. It is easy to install and operate, and provides consistent and reliable performance every time you print. Whether you're printing documents, reports or presentations, this toner cartridge is the perfect choice for your printing needs.