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 Litetronics LS-4152 bulb is equipped with a heavy-duty 130 volt filament, allowing it to last longer when operated at 120 volts. With a 6,000 hour life, this bulb has more than twice the lifetime of similar bulbs. This Chimney style bulb mimics the profile and gas flame of an antique hurricane lamp.