Toner cartridge with new MICR toner is designed for use with HP LaserJet Pro 4001 Series and 4101 Series. Standard-yield 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. Cartridge yields approximately 2,900 pages.Toner cartridge with new MICR toner is designed for use with HP LaserJet Pro 4001 Series and 4101 Series. Standard-yield 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. Cartridge yields approximately 2,900 pages.