Genuine Lexmark Supplies are engineered to work best Together with your Lexmark printer, delivering excellent print quality from the first page to the last. Lexmark offers customers a broad choice of laser toner cartridges and recycling options including Easy return to Lexmark. For superior results, always use genuine Lexmark Supplies. 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 innovative shake-free Print system. Includes high yield print cartridges C331HK0 black, C331HC0 cyan, C331HM0 magenta and C331HY0 yellow. Black cartridge yields up to 3, 000 pages; colors 2, 500 pages. For use with Lexmark C3326dw and MC3326adwe color laser devices.