SharpestImaging HP 27X C4127X Compatible MICR Toner Cartridge for Check Printing for HP LaserJet Printers 4000 4050 MICR Cartridge with magnetic toner for check printing. Compatible with OEM #: HP 27X / C4127X High Yield: 10k Pages based on 5% coverage; prints 30k checks @ 3 per page For use in HP LaserJet Printers: 4000, 4000n, 4000t, 4000tn, 4000se, 4050, 4050n, 4050t, 4050tn, 4050se