Evolis YMCKO ribbon prints a full spectrum of colors by combining yellow, magenta and cyan panels and using varying degrees of heat. The K panel is a black resin panel, typically used for printing text and bar codes, and the O panel is a thin, clear protective overlay that is applied over the entire surface of your cards. Evolis Ribbon is specially back-coated to extend printhead life. It generates approximately 300 full-color prints in Evolis Primacy and Elypso printers.