Designed to optimize the performance & life of your printers, Unison Contract Cartridge delivers superior print quality page after page in your Lexmark MS331, MS431, MX331 & MX431. Special characteristics & performance attributes of Unison Toner's unique formulation enable shake-free performance, consistently outstanding image quality, long-life system reliability & amazing sustainability. Recycle empty cartridge through Lexmark's unique Cartridge Recycling Program that makes sustainable printing as beneficial to your organization as it is to the environment. High-quality, standard-yield cartridge generates approximately 3,000 pages.