B231000 Black Return Program Toner CartridgeKeep up front costs low and quality high with Genuine Lexmark cartridges. Standard Yield cartridges offer a lower purchase price and contain fewer pages than High Yield cartridges do. Perfect for low volume printing. Monochrome Laser. Essential to Lexmark print system performance, Unison Toner's unique formulation consistently delivers outstanding image quality, ensures long life print system reliability and promotes superior sustainability all in an