With a 20,000 page estimated yield, the original Lexmark 51B2X00 provides owners of all compatible printers with a low cost per page for select monochromatic laser printers. The genuine 51B2X00 toner cartridge is compatible with a whole host of printers including the Lexmark MX517de.As this Lexmark 51B2X00 toner cartridge has been produced by the manufacturer of your printer, you can expect an unbeatable quality of print immediately upon installation. The genuine 51B2X00 comes with a full guarantee from Lexmark for your peace of mind.