Extra high capacity toners, like this Xerox 006R04378, are a great way of getting the lowest cost per page with genuine cartridges. You can use this top-quality Xerox 006R04378 black toner cartridge in conjunction with the B310 and any other compatible printer found listed on this page. The Xerox 006R04378 has an estimated page yield of 20,000 pages, meaning the price per page is actually very low for a genuine consumable. Xerox are incredibly confident in the 006R04378 and even offer a direct warranty on the unit, in the rare instance that a problem occurs.