MICR Toner International Compatible Toner Cartridge Replacement for HP M551N ( Black,Cyan,Magenta,Yellow , 4-Pack ) 3-Pack Toner Set - HP Printers: M551N, M551DN, M551XH, MFP M575DN, MFP M575F, MFP M575C Hi-Yield Black: 11,000 standard pages | Colors: 6,000 standard pages 3-Pack OEM Part #s: CE400X, CE401A, CE402A, CE403A If you do not receive your product in an MTI-branded box, it is not a genuine MTI product. Let Amazon know.