microMICR MICR Toner Cartridge, Alternative for HP 42A, Laser, 10000 Pages, Black, 1 Each (MCMMICRTHN42A) EachMICR toner cartridge is designed for use with HP LaserJet 4240, 4250 and 4350 series Intelligent Printers: 4240n, 4250, 4250n, 4250tn, 4250dtn, 4350n, 4350tn, 4350dtn and 4350dtnsl. Cartridge contains magnetic image character recognition ink for security purposes in printing checks. Smart print cartridge is estimated to yield 10,000 pages at 5 percent coverage. General Information Manufacturer: microMICR Corporation Manufacturer Part Number: MICR THN