The product is a set of four 13R664 color drum chips designed for use with Xerox 550, 560, 570 WC 7965, and 7975 printers. These drum chips are compatible with Xerox printers and are specifically manufactured for tri-color print technology. Made in China, these high-quality drum chips come as a unit quantity of 4 pieces, ensuring a reliable and consistent printing experience with your Xerox printer. Ideal for those looking to refill their printer with genuine Xerox drum chips for optimal performance.