MICR Black Laser Toner Cartridge for Lexmark / IBM 1380200 / 1380520 (IBM 4019, 4028, 4029) - Compatible Black MICR Toner Cartridge (7000 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).