Zebra ZXP Series 8 YMCKKI Color Ribbon Zebra i Series YMCKKI 6 Panel Ribbon for the Dual-Sided ZXP Series 8 Printer.415 Images per Roll. YMCKKI ribbons consist of yellow (Y), magenta (M) and cyan (C) panels for printing a full spectrum of colors by combining the colors using varying degrees of heat. The two K panels are black resin, typically used for printing text and barcodes. The (I) panel is an inhibitor panel that prevents re-transfer film from adhering to surface foils on the front of the card or signature panels on the back of the card. YMCKKI ribbons are for retransfer, dual-sided printing with YMC and the first K panel printing on the front side, the second K panel prints on the back side of the card and the I panel is used on either the front or back of the card.