This is a remanufactured/compatible HP C8543X - Black HY MICR Toner Cartridge (30000 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). For use in HP LaserJet 9000 9000n 9000dn 9000hns 9000hnf 9000mfp 9000Lmfp 9040 9040n 9040dn 9050 9050n 9050dn Troy MICR 9000 9040 9050 Printer Series. Compatible with MICR Cartridges: C8543M C8543X 02-81081-001 0281081001 TJN-43X.