Xerox Genuine Phaser 3610, WorkCentre 3615 Black Extra High capacity Toner Cartridge (25300 Pages)- 106R02731 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.