Entrust CMYKP-KP pigment ink ribbons are used for printing full-color, black panel for text and barcodes on one side (card flip), black panel for text and barcodes. Featuring an Earth-friendly biodegradable core, CMYKP-KP ribbons consist of cyan (C), magenta (M), yellow (Y), primer (P), black and (K) panels. Primer panel is needed to adhere images to all card types. Optimal use: dual side - Full color and black text on front, black text on back. Alternate use (2 panel sets): dual side - Full color and black text on front, Full color and black text on back.