C Series (YMCUvK) 5-panel Color Ribbon, 500 Images/roll. The ribbon is used to print in a variety of colors: yellow (Y), magenta (M), cyan (C), fluorescing panel (Uv), and black (K). The fluorescing panel allows for images to be seen with the presence of ultraviolet (UV) light, which adds extra security to your card. The ribbon is used to print text and full color images on one or both sides of a card. This ribbon is compatible with P620, P630i and P640i Printers.