Brightown 25 Pack C9 Incandescent Bulb, C9 Replacement Bulb for Christmas String Light, E17 Intermediate Base, 7 Watt, Clear 120 Volt, 7 watt, E17 Base. Clear bulbs, 25pc Commercial grade bulbs with average lifespan of 3,000 hours. UL listed for indoor & outdoor safe use. Length: 2 15/16" Width: 1 1/8"