Compatible with the following Brother Printers HL-6050D HL-6050DN HL-6050DZ HL-6050DNZ Features Up To 30,000 pages @ 1 page per job The drum unit yields up to 30,000 pages. When "CHANGE DRUM SOON" message appears on the LCD, you should order a new drum unit to be prepared for when the drum unit (DR-4000) nees to be replaced.