2 x Black Drum Unit Replace DR3400. Brother DCP-L5500DN DCP-L6600DW HL-L5000D HL-L5100DN HL-L5100DNT HL-L5200DW HL-L5200DWT HL-L6250DN HL-L6300DW HL-L6300DWT HL-L6400DW HL-L6400DWT MFC-L5700DN MFC-L5750DW MFC-L6800DW MFC-L6800DWT MFC-L6900DW MFC-L6900DWT Printers.
