11 WATT S14 SHATTERPROOF COATED SIGN LIGHT BULB - LONG LIFE - 130 VOLTS - SHATTER RESISTANT BULB - Bulborama Industrial Grade 3,500 hour shatterproof tough coat 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. Tough coat shatterproof bulbs contain an rubberized outer coating to prevent bulb shattering and comply with city and state fire codes. 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.