Thermal Transfer printers print by transferring the print image from a resin or wax-resin coated plastic ribbon to plain label stationery. These printers are also capable of printing in Thermal Direct mode by omitting the ribbon and using thermal paper label stationery. Thermal Transfer printers are recommended if your labels need to be high quality or are required to be legible for a very long time, or if you will be printing on plastic label materials such as polyethylene or polyester, especially for use outdoors in direct sunlight or in wet environments. Use a resin ribbon if you are printing on plastic labels. Use a wax-resin ribbon if you are printing on paper labels.