Capable of improving the quality of your prints significantly, this imaging unit is compatible with your Xerox Phaser 6115 or 6120 printer. The imaging drum assembly in your Xerox laser printer uses an electrostatic charge that is transferred to form text and images on the page. Due to general wear and tear the drum unit will start to diminish in effectiveness over time. Replace with this unit with a yield of up to 20,000 prints.