Xerox Genuine B305 / B310 / B315 Black Extra High Capacity Toner Cartridge (20000 pages) - 006R04378 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 colours. With over 75 years' experience Genuine Xerox Supplies are something you can rely on.