Zebra ZXP Series 7 - IX Series YMCKOK Colour Ribbon 250 Images/roll. The ribbon is used to print in a variety of colours: 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 printing in black on the back side of the card. The ribbon is used to print on both sides of the card. This ribbon is compatible with the ZXP Series 7 Printer.