Designed with low intensity users in mind, the standard capacity genuine Brother TN421M carries a reduced amount of toner (and lower price tag to match). With an estimated 1,800 prints from the Brother TN421M, a small office is sure to be happy using the magenta toner cartridge for an extended period of time.If your printer is compatible with the original Brother TN421M but you are looking for a printer cartridge with a lower cost per page, be sure to click the link to your printers full listing on this page. Following this link you will find all products compatible with your Brother printer listed, including this genuine TN421M.