These Double Contact Bayonet Base Light Bulbs are a general purpose incandescent light. Constructed of heavy duty glass bulb housing and filament for break resistance and longevity with nickel plated brass base for corrosion resistance and positive contact. 441143 bulb has a red lenses. 441034 and 441157 (pictured) are dual filament bulbs. 441082 is 6.5VDC; all others are 12.8VDC.