Brothers DR-3100 Laser Printer Drum Unit works independently from the toner cartridge, which is more economical than if the two were combined. If one runs out, you only need replace that item, therefore reducing waste & cost! The Brother DR-3100 Laser Printer Drum Unit is compatible with Brother DCP-8060, DCP-8065DN, HL-5240, HL-5250D, HL-5250DN, HL-5270DN, HL-5280DW, MFC-8460N, MFC-8860DN & MFC-8870DW laser printers.