The HP Laser Jet 131X (CF210X) Black Toner Cartridge is a genuine/original product made by HP in Japan. It is designed for use with LaserJet Pro M276 and LaserJet Pro M251 printers, ensuring high-quality printouts with crisp, clear black text. This unit is sold as a single package and is ideal for users looking to replace their current black toner cartridge with a genuine HP product for optimal printing performance.