7.5 WATT S11 CLEAR SHATTERPROOF LIGHT BULB INDUSTRIAL GRADE TOUGH COAT PREVENTS GLASS SHATTERING. Industrial Grade 3500 hour tough coat incandescents are engineered to last up to 10 times longer than standard light bulbs, therefore reducing operational costs. Tough coat lamps contain a rubberized outer coating to prevent bulb shattering and comply with city and state fire codes. Equipped with a rugged 5 filament support, pure tungsten coil, and brass base, Bulborama Industrial Grade 3,500 hour sign lamps are engineered to last up to 10 times longer than standard bulbs, therefore reducing operational and maintenance costs, and saving both time and money. Industrial Grade lamps are built with brass bases to prevent socket corrosion and multi-support filaments to resist shock and vibration in any burning position.