Toner cartridge with new MICR toner is designed for use with Lexmark MS821, MS822, MS725, MS823, MS824, MS825, MS826, MX721, MX722, MX725, MX822, MX824 & MX826. Cartridge contains magnetic image character-recognition ink for security purposes in printing checks. It must be used with the MICRIMA821 imaging unit. Cartridge yields approximately 7,500 pages.