This is a genuine Xerox Drum Cartridge guaranteed to perform with the Xerox WorkCentre™ Pro 421DE Digital Copier, WorkCentre Pro 421DEi Digital Copier, WorkCentre Pro 416 DC, WorkCentre Pro 416, WorkCentre Pro 416Pi, WorkCentre Pro 416Si, WorkCentre Pro 421E Digital Copier, WorkCentre Pro 421 Multifunction