I Series full-color (YMCKO) Ribbon, 6 pack of 200 Images/roll. The ribbon is used to print in a variety of colors: yellow (Y), magenta (M), cyan (C), and black (K). The remaining overlay (O) provides an extra layer of protection for the card. This ribbon is used to print color on one or both sides of a card. This ribbon is compatible with P330i, P430i, P520i, P310i, P320i, P420i Printers.