Ultra high-yield toner cartridge is perfect for efficient, high-volume printing in your Brother HL-L6400DW, HL-L6400DWT & MFC-L6900DW. All genuine Brother printer supplies are designed as part of an entire printing system to provide a superior degree of quality. Genuine Brother toner is delicately balanced to provide even flow & toner distribution. All genuine Brother printer supplies are designed as part of an entire printing system. Cartridge yields approximately 20,000 pages.