Original four-colour imaging drum units (like the Xerox 106R01582) deliver and distribute toner powder from your toner cartridge wherever it needs to be within your printer. Thankfully Xerox have made this genuine 106R01582 colour image drum incredibly hard wearing and estimate that it will help you produce 145,000 prints from this single unit.Compatible with several quality Xerox laser printers including the 7800, this original 106R01582 is an essential purchase.