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