Renewable Toner Compatible Toner Cartridge High Yield Replacement Okidata 43502001 for Oki B4550 B4550n B4600 B4600n Lifetime warranty. We honor our warranty regardless of purchase date. Please contact us if the Amazon return window has closed. Color: Black OEM #: Okidata 43502001 High Yield: 7,000 pages based on 5% coverage For use in Oki Laserjet B4550, B4550n, B4600, B4600n, B4600n PS printers