30W tungsten filament reproduction "Squirrel Cage" light bulb. This historic bulb is made up of a series of up and down filaments which make up a "cage" around the center glass pillar support. Bulb has a standard Edison base and measures 5 3/4" tall by 2 1/2" in diameter. This bulb is brighter than it's carbon filament counterparts. This was a very popular bulb in the early days of electric lighting. This light bulb is great for authentic lighting concepts and exposed socket fixtures. Rated for 120 Volt and 30 Watts power.