Satin string bulbs have an etching on the outside of the glass envelope distort the look of the filament and reproduce the look of a gas flame. This satin string bulb is a great option for antique restorations. The Bulbrite 430025 bulb is equipped with a heavy-duty 130 volt filament, allowing it to last longer when operated at 120 volts. The candelabra base on this bulb fits into most chandeliers and other candelabra sockets. With a 5,000 hour life, this bulb has nearly twice the lifetime of similar bulbs.