HP CE278AD (#78A) Twin Pack Genuine Black Toner Cartridge - 2,100 Pages x2HP #78A Genuine Black Toner Cartridge Twin Pack This HP # 78a Toner Cartridge will help to keep your printer producing sharp, crisp, professional documents. It's specially designed to work with HP printers and is easy to install so you can do it yourself. This cartridge can also be known by its model number CE278AD It has an estimated page yield of 2,100 x 2 toners This cartridge is compatible for use with your HP LaserJet Pro M1536, P1566, P1606 and