Renewable Toner Compatible Toner Cartridge Replacement for Lexmark 521 52D1000 MS810 MS811 MS812 Printers LOW COST, HIGH VALUE. RT replacement for Lexmark 52D1000 toner. Printing cost is as low as .005 cents per page, up to 60% less than Lexmark 52D1000 original toner cartridges. QTY: 1 (1 Black) RT Compatible Lexmark 521 toner cartridge REPLACES OEM #: Lexmark 521 52D1000 | Yield: 6,000 pages based on 5% coverage FOR USE in Lexmark Printers: MS812de MS812dn MS810de MS811dn MS810dn MS812dtn MS810n MS811n MS810dtn MS811dtn LIFETIME WARRANTY. We honor our warranty regardless of purchase date, even if the Amazon return window has closed