The Genuine HP C4191A Laserjet Black Toner Cartridge is a high-quality printer accessory designed specifically for HP printers. This original HP product ensures optimal printing performance and professional results. The black toner cartridge is compatible with HP printers 4500 and 4550, providing consistent and reliable printing. This new, sealed cartridge guarantees a fresh supply of toner for all your printing needs. Trust in the HP brand for exceptional print quality and efficiency.