Our Toner Cartridge replacements for the Okidata B4550n cartridges are designed and manufactured by an ISO-9001 facility and match Genuine name-brand cartridges at a fraction of the cost. These Okidata B4550n Toner Cartridges will provide optimal print quality and page yields. We've been selling products like compatible B4550n Toner Cartridges for over 13 years and think you'll find great value in comparison to the OEM Okidata B4550n supplies.