Genuine Brother TN-135Y high capacity yellow toner cartridge For the 4000 series printers including the HL-4040CN, HL-4050CDN & HL-4070CDW and the 9000 series multifunction machines including the DCP-9040CN, DCP-9045CDN, MFC-9440CN & MFC-9840CDW. Up to 4,000 pages at 5% coverage