Toner cartridge with new MICR toner is designed for use with HP LaserJet M611, M612 Series; LaserJet Enterprise MFP M634, M635 & M636 Series. Standard-yield cartridge contains magnetic image character-recognition ink for security purposes in printing checks. It uses special MICR toner developed & tested specifically for each model printer, retaining the original components & keeping the OEM factory seal intact. Cartridge yields approximately 10,500 pages.