Renewable Toner Okidata 43502301 MICR Toner Cartridge Yield 3500 for check printing compatible with Oki Printers B4500 B4500n B4550 B4550n B4600 B4600n B4600n P Lifetime warranty. We honor our warranty regardless of purchase date. Please contact us if the Amazon return window has closed. Magnetic toner for printing checks OEM Part #: Okidata 43502301 / B4600 Yield: 3,500 pages based on 5% coverage; prints 10.5k checks @ 3 per page Okidata Printers: B4500, B4500n, B4550, B4550n, B4600, B4600n, B4600n