The product is a set of four imaging units (drum chips) designed specifically for use with Xerox WorkCentre 6400 printers. These black, cyan, magenta, and yellow drum chips are compatible with Xerox printers and are manufactured in China. Refilling your Xerox WorkCentre 6400 with these high-quality drum chips ensures optimal printing results and helps extend the life of your printer. Perfect for those looking to replace worn-out or depleted drum chips in their Xerox printer for continued efficient printing.