The HP 42A Q5942A Black Genuine Original Toner is specifically designed for use with HP LaserJet 4240, 4250, and 4350 printers. This sealed toner cartridge ensures high-quality black printing and is backed by a 12-month manufacturer warranty. With a genuine/original print technology, you can trust that this product will deliver reliable and professional results for your printing needs. Perfect for those looking for a dependable and compatible toner option for their HP printer model.