In addition to one of the many different Xerox toner cartridges available, you will also need a high quality imaging drum unit (like the 108R01420) for your colour laser printer. The toner cartridges dispenses the black toner powder and the original Xerox 108R01420 drum unit distributes it exactly where it needs to be on the page.The genuine Xerox 108R01420 image drum offers a much larger 48,000 page estimated yield than the toner cartridge, meaning it needs replacing much less frequently. The Xerox 108R01420 helps keep your print quality high and is an essential purchase.