Deck your halls and boughs of holly with these warm green incandescent mini lights. The 100 Christmas light bulbs are spaced 2.5 inches apart on green wire making them the ideal lights to wrap wreaths, metal and wooden arches, and topiaries. UL listed for indoor and outdoor use, the string averages 3,000 hours. Up to 3 sets of the 21-foot strings can be connected end-to-end. Your house will be singing holiday tunes with these versatile and bright colorful lights.