i Series Full Color 6 Panel (YMCKOK) Ribbon with 1 cleaning roller, 170 images. 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. The second (K) allows for black printing on the back of the card. This ribbon is used to print text and full color images on one side and black on the back side of the card. Compatible with P420i, P430i, P520i.