Full Color (YMCKOK) ribbon, 250 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. he second (K) allows for printing in black 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 Enduro, Enduro+, Enduro3E and Rio Pro ID Card printers..