The High Capacity Black Toner Cartridge for C310 Printer from Xerox is specially formulated for the Xerox C310 to ensure the best print quality possible and deliver consistent and reliable results, page after page. As a use and return cartridge, it is offered at a discounted price. In return for the lower price, the end-user agrees to use the cartridge once and then return it free of charge to Xerox for proper recycling.