Make your treetops glisten when you decorate with clear incandescent Christmas mini lights. The 100 incandescent bulbs are spaced 2.5 inches apart on green wire, so they are ideal for wrapping metal and wooden arches, wreaths, and garlands. UL listed for indoor and outdoor use, the strings average 3,000 hours of trouble-free lighting. 3 sets of the 21-foot strings can safely be connected end-to-end. Let these warm incandescent lights bring sparkle to your holiday or year round lighting design.