The Imaging Drum Kit from Dell is specifically designed for use with Dell Color Laser Printer. This kit includes an imaging drum and instructions on how to replace it. It applies toner to the page and offers a usable life of approximately 42,000 pages when printing 100% mono pages, decreasing to 10,500 pages when printing 100% color pages. The toner yield based on testing in accordance with ISO/IEC 19798. Yields vary with usage and environmental conditions.