Original mono imaging drum units (like the Xerox 113R00670) deliver and distribute toner powder from your toner cartridge wherever it needs to be within your printer. Thankfully Xerox have made this genuine 113R670 black image drum incredibly hard wearing and estimate that it will help you produce 60,000 prints from this single unit.Compatible with several quality mono laser printers including the Xerox Phaser 5550VDT, this original 113R00670 is an essential purchase.