Lexmark MS/MX317/417/517/617 Return Program Toner Cartridge, Black, Standard Yield (51B1000)Take advantage of the shake free system to create bold documents that have crisp, accurate black lines. This black toner cartridge's Unison formulation provides every printout with consistent, high quality text and images, so your documents look clean and professional. This Lexmark standard yield toner works with select Lexmark printers and yields 2,500 pages, providing a smart option for small businesses or home offices.