Making sure that your W840 series printer provides the results you want requires more than just ensuring you are using the right cartridges. Laser printers feature a complex and delicate printing system and if one component isn't working properly, you can be certain that results will suffer. Lexmark Photoconductor Kits are essential for providing the best level of definition in your prints, ensuring that the toner is properly applied to the page. This unit offers up to 60,000 page yield.