These transparent blue C7 replacement bulbs create striking displays. The Christmas light bulbs are triple dipped for rich, deep color yet still let the warm incandescent filament shine through. The bulb uses only 5 watts, and at 130 volts, lasts longer giving you an average of 3,000 hours of trouble-free lighting. UL listed for indoor and outdoor use and comes economically packaged in boxes of 25. These bulbs will make your house or office lighting scheme dramatic and vibrant for many years to come.