Our remanufactured OKI 09004391 toner cartridge offers the same 4,000 page estimated yield as the original. Thanks to the quality of the black toner powder our manufacturers use to refill the OKI 09004391, these units offer a wonderful quality of print. Remanufacturing OKI 09004391 toner cartridges is quite an involved process and all of the worn parts that cannot be reused, have been switched for compatible alternatives. These remanufactured OKI 09004391 toner cartridges still come fully guaranteed for an extended 3-year period, making their purchase risk-free.