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Suitable for Sharp JX9500.
A drum unit transfers the image onto the paper in a laser printer. Not all printers need a seperate drum unit. Drum units are used in conjuction with toner cartridges that do not have the drum unit included. Mono printers have one drum, colour printers can either have one drum for all four colours, or four drums (one for each colour - black, cyan, magenta and yellow).