Compatible MICR HP 27X Toner Cartridge. COMPATIBLE MICR HP 27X Toner Cartridge (HP C4127X). Ultraprecise Print Cartridge for Laserjet 4000 / 4050 Series, Maximum Capacity. HP Compatible COM-C4127XMICR Fits printer models: LaserJet 4000/4000se/4000n/4000t/4000tn, LaserJet 4050/4050se/4050n/4050t/4050tn/4050 USB-MAC MICR Cartridge with magnetic toner for check printing For use in HP LaserJet Printers: 4000, 4000n, 4000t, 4000tn, 4000se, 4050, 4050n, 4050t, 4050tn, 4050se