Color 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. YMCKO Color Ribbon includes a cleaning roller and yields approximately 200 color prints in Zebra ZC300 Card Printers.Color 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. YMCKO Color Ribbon includes a cleaning roller and yields approximately 200 color prints in Zebra ZC300 Card Printers.