Unlike other drum units, the all-in-one genuine Brother DR-321CL drum unit is used for black, cyan, magenta and yellow prints. It will be easy to use and install the Brother DR321CL image drum in one go instead of having individual drum units to replace for each colour. With the genuine DR-321CL drum unit in use, printed text or images will come out with sharper details and brighter colours. This original Brother DR321CL drum unit is durable and will not need frequent replacement as it lasts for as many as 25,000 pages. Resolve imaging problems and keep your colour laser system in excellent condition by using this new DR321CL laser image drum.