Do not buy if you don't like stains. Manufacturing defects on the green OPC drum in the Xerox toner cartridge (see photo) result in a series of black dots being printed on each copy. Three of the last four Xerox Ultra High Yield Black Toner Cartridges (11,000 pages) 106R02313 had the same error. Poor quality control for such an expensive product (retail price over $200). Since there is no way to fix a defective drum, these Xerox toner cartridges are virtually useless. If you're lucky you might be able to return them to Revain or the place they were purchased from. My calls to Xerox customer support went unanswered, so I may have to give up my Xerox copier/printer and switch to Hewlett Packard or another brand with more reliable copy and print quality.