Welcome to the Xerox 4050 product page. Here you can find information and pricing for your Xerox 6R301 ( 6R501 ) Premium Compatible Toner Cartridge, box of 3, black. Easy online ordering of your 6R301 ( 6R501 ) Genuine Xerox Toner Cartridge, box of 3, black, 6R301, can be completed from this page. Tonerprice.com backs all of our cartridges with our exclusive warranty. As always, we provide free ground shipping on orders over $75 within the contiguous United States from 5 warehouses nationwide.