Xerox Genuine CopyCentre 133/ C123/ C128/ WorkCentre 133/ M123/ M128/ Pro 123/ 128/ 133 Black Toner Cartridge (up to 30,000 images)- 006R01184 is specially formulated and tested to provide the best image quality and most reliable printing you can count on page after page. Xerox Genuine Supplies and Xerox equipment are made for each other. Accept no imitations. Compatible toners may risk breakdown of Xerox printers and result in poor print quality and weak colors. With over 75 years' experience, Genuine Xerox Supplies are something you can rely on.