This shatter resistant Precision Lighting PFA-60ARS rough service light bulb has multiple support filaments to prevent premature burnout from the constant movement and vibration encountered in commercial and industrial applications. The P.F.A. coating (Teflon) around the bulb is a very unique material that combines extreme temperature resistance with high clarity, excellent adhesion and high impact strength. Operating at 60 watts, it has a medium (E26) base and an average life of 10,000 hours. When safety is a concern, shatter resistant light bulbs are the only option.