Novelty Lights Blue C9 LED Smooth Ceramic Bulbs (plastic). These bulbs have the traditional look of our popular incandescent ceramic bulbs, but are 90% more energy efficient! These LED bulbs will save you money on energy costs, but you can still enjoy the same vintage look of a painted ceramic bulb. Unlike their incandescent counter-parts, these bulbs will not get hot, giving you more options for indoor and outdoor applications, and they are plastic so they won't break! Lasting 40,000 hours, these vintage blue C9 bulbs will provide years of beautiful holiday illumination for your Christmas tree, roofline display, or outdoor Christmas light display. Use these antique style, yet energy efficient bulbs with our C9 Stringers (25' & 100'), our E17 Heavy Duty Light Strings (25', 100' & 330'), our commercial grade bulk 1000' C9 spools as well as our vintage Twisted Wire Strings with E17 Bakelite Sockets. Each bulb utilizes 2 Ultra-Bright SMD LED Technology, does not produce heat, and is vibration resistant.