A colour image drum like this DR421CL produced by Brother handle the toner powder from the associated toner cartridges and help distribute it, where necessary, across the paper. Such an important job is best left to the original manufacturer of your Brother printer, so the genuine DR-421CL is the ideal solution.Estimated to offer you an impressive 30,000 prints from this single unit, the original Brother DR421CL is a reasonably priced essential component for your printer. Whenever you buy a genuine Brother product like this DR421CL imaging drum unit, you can an unbeatable quality of manufacture.