Speedy Inks Compatible Toner Cartridge Replacements for Lexmark 521 52D1000 (Black) For use in: MS810DE, MS810DN, MS810DTN, MS810N, MS811DN, MS811DTN, MS811N, MS812DE, MS812DN, MS812DTN Page Yield: 6000 | Color: Black Shelf Life: 24-36 Months The use of aftermarket replacement cartridges and supplies does not void your printer's warranty