Rio 12 oz. Opaque Ultra-Smooth can be used for printing on one or two sides. With an ultra-smooth surface, this product is compatible with screen printing, digital printing, and pressure-sensitive lettering. It is intended for both indoor displays and outdoor displays for short-term usage (less than 6 months). Its opaque barrier helps to eliminate image show-through. Additionally, this product has been engineered to be fire retardant to pass NFPA-701.