The Zebra 800012-543 YMCUvK ribbon for the Zebra ZXP Series 8 & 9 ID card printers is designed to print a full spectrum of colors using varying degress of heat to combine colors. The UV panel is a fluorescing panel that allows you to print grayscale text or images that are only visible with ultraviolet (UV) light. The K panel is a black resin panel, typically used for printing text and barcodes. Each roll of the 800012-543 prints 500 full color prints for all of your printing needs.