MICR toner cartridge is designed for use with HP LaserJet 2100 and 2200 Series Printers: 2100, 2100se, 2100xi, 2100M, 2100TN, 2200d, 2200dt, 2200dtn and 2200dn. Cartridge contains magnetic image character-recognition ink for security purposes in printing checks. Cartridge is estimated to yield 5,000 pages at 5 percent coverage.