MTI MICR Okidata 43502001 Toner Cartridge (Yield: 7,000) for Oki Printers: B4550, B4550n, B4600, B4600n High Yield: 7,000 pages (Magnetic toner for check printing) Replaces OEM Part #s: 43502001 MICR Okidata Printers: B4550, B4550n, B4600, B4600n, B4600n PS MICR Toner International cartridges are built using brand new parts and materials for quality you can trust. NONE of our products use RECYCLED/RENEWABLE materials.