Speedy Inks Compatible Toner Cartridge Replacement for Lexmark 501U 50F1U00 Ultra High Yield (Black) Compatible Printers: MS510DN, MS610DE, MS610DN, MS610DTE, MS610DTN Page Yield: 20000 | Color: Black Shelf Life: 24-36 Months The use of aftermarket replacement cartridges and supplies does not void your printer's warranty