Imaging Drum Rainbow Pack CMY (30,000 Pages) for Xerox Phaser 7400 Printers. Colour Imaging Unit Kit, Phaser 7400 This imaging unit kit includes three imaging units--Cyan, Magenta and Yellow--in one pack, providing a convenient, lower-cost alternative to purchasing them separately. These imaging units are all engineered exclusively for the Xerox Phaser 7400 Color Printer and are designed to interact perfectly with other Xerox supplies to guarantee consistent, brilliant print quality and performance.