Page Yield*: 3000 *Per Cartridge at 5% coverage (ISO/IEC standard) Compatible with the following Okidata OKI B Series Printers: B4400, B4400n, B4500, B4500n, B4550, B4550n, B4600, B4600n, and B4600n PS Color: Black Please contact us first with any product issues. We want all of our customers to be happy because happiness matters.