MICR toner cartridge is designed for use with Hewlett-Packard LaserJet M601, M601DN, M602N, M602DN, M602X, M603N, M603DN, M603XH and M4555MFP Series. Cartridge contains magnetic image character-recognition ink for security purposes in printing checks. Cartridge is estimated to yield 10,000 pages at 5 percent coverage.