Toner cartridge with new MICR toner is designed for use with HP LaserJet Enterprise Flow MFP M528c; LaserJet Enterprise MFP M528f, M528dn, M528z; LaserJet Enterprise M507x, M507dn and M507n. Cartridge contains magnetic image character-recognition ink for security purposes in printing checks. It uses special MICR toner developed and tested specifically for each model printer, retaining the original components and keeping the OEM factory seal intact.