Produce magnetic-character documents on compatible HP laser printers with MICRO MICR MICR-THN-104M black MICR toner. This cartridge is intended for printer environments using the HP W9004MC supply format where printed characters need magnetic properties in addition to visible black text. Typical applications include checks and business forms that carry machine-readable banking or control information. MICR toner differs from ordinary black toner because it is used to print characters that can be read magnetically by compatible document-processing equipment. That requirement matters for documents where character placement, printer configuration, paper stock, and the organization’s document-processing workflow must work together. The cartridge supplies black output for these specialized print jobs while retaining the HP cartridge format specified for the installed printer. Use this supply in an HP printer configured for the W9004MC cartridge format, rather than substituting a conventional black toner cartridge for MICR-sensitive forms. Verify the printer’s accepted supply reference before installation and maintain the print settings used for the organization’s approved check or form layout. The cartridge is a focused option for sites that need MICR capability from an HP laser-print workflow, not simply standard monochrome document output.