C9 OptiCore Commercial LED Halloween String Lights (50 ct, 50 ft, Black Wire). Looking to take your Halloween decorations to the next level? These C9 OptiCore bulbs on black wire are perfect for creating a vivid October scene. OptiCore bulbs are made of polycarbonate, up to 200 times stronger than glass, so they’re virtually unbreakable. The bulbs are thicker too, so light penetrates the lens more evenly, creating vivid color distribution. The bulbs are paired with black 18-gauge commercial grade stringer that features weep holes for trouble-free wet weather performance. And OptiCore string lights are so energy efficient you can connect up to 500 ft. Of lights end to end from a single power outlet. Long lasting too, with a 60,000-hour average life expectancy. Owned and -based company with U. Set of 50 OptiCore C9 commercial grade polycarbonate Halloween lights, up to 200 times stronger than glass, practically unbreakable. Comes in a smooth or faceted bulb finish, each creating a different mood. Commercial grade 18 gauge black stringer features sockets with weep holes for trouble-free wet weather performance. Average life expectancy: 60,000 hours. Thick polycarbonate lenses distribute the light evenly across the lens, for rich color and beautiful light. Energy efficient: connect up to 500 feet of lights together end to end from a single power outlet. Nickel plates bulb bases prevent corrosion and improve connectivity. Rated for indoor or outdoor use.