Lexmark High Yield Black Toner Cartridge to fit a Lexmark W840 printer. Page Yield - 30000. OEM Ref - 00W84020H. Allowing you to make the most out of your W840 printer, Lexmark Toner Cartridges are perfect for everyone that cares about printing. Providing results that have an excellent level of precision, Original Cartridges provide you with results that cannot be matched by compatible cartridges. With a high yield, this cartridge provides almost double the amount of printing as a normal cartridge, making it more economical and longer lasting. The perfect solution for high volume printing, offering up to 30,000 pages.