This is a compatible HP CC364X - Black MICR Toner Cartridge (24000 Yield). MICR is an acronym for Magnetic Ink Character Recognition. MICR Cartridges are used for printing checks. Banks read magnetic ink differently than standard ink, which allows them to reliably process checks. Magnetic Ink Recognition Toner; Regular toner mixed with IRON OXIDE particles, recognized by scanning devises. Mainly used for Check printing and bar coding. Built with NEW drums and NEW components that match all ABA standards (American Bankers Association). This HP MICR Toner Cartridge is a Black toner used in MICR check printing. For use in HP P4014n, HP P4015n, HP 4015, HP LaserJet P4015n, 4014, P4014, P4015, P4515, P4515n, 4515, Troy P4014, Troy P4015, Troy P4515, Troy MICR 4014 Printer Series, Troy MICR 4015 Printer Series, Troy MICR 4515 Printer Series. Compatible with MICR Cartridges: CC364A, CC364X, THN-64A, THN-64X, 02-81300-001, 02-81301-001.