Produced by Lexmark themselves, to their own exacting standards, this genuine 56F2000 Return Program toner cartridge offers users of compatible laser printers exceptional value. With an estimated yield of 6,000 prints (each looking as good as the last) you will be glad you invested in Lexmark quality with this 56F2000 toner cartridge.You can use this original 56F2000 toner cartridge in many different laser printer, including the popular Lexmark MS421dn. Genuine Lexmark toner cartridges, like the 56F2000, work beautifully at the precise temperatures produced by your printer, fusing black toner powder precisely and offering clear results.