YMCKOK ribbons consist of yellow (Y), magenta (M) and cyan (C) panels for printing a full spectrum of colors, an O panel for a clear protective overlay, the 2 K panels for black or greyscale text/images. One for the front of the card, one for the back. YMCKOK ribbons are for dual-sided printing, with YMCKO print on the front side and the second K panel prints on the back side of the card. With our 30-day money-back guarantee, you can be sure you’re getting the best product for your money. Also included is a cleaning roller.