Brother Genuine Ultra High-Yield Black Toner Cartridge TN439BK delivers crisp, professional laser output with 9,000 page yield. All Brother Genuine supplies are designed as part of a complete intelligent printing system to provide superior quality and reliability. Brother Genuine toner is precisely balanced for even flow and consistent toner distribution. Use only Brother Genuine toner cartridges for reliable results and enjoy ongoing improvements and technical changes, which regularly occur throughout the hardware lifecycle.