Make your trees and decks glisten when you decorate with this heavy-duty commercial grade, clear mini Christmas light set. The 100 incandescent 170ma/2.5V super bright bulbs are spaced 5 inches apart on 22AWG brown wire, which can wrap tree trunks, posts, and topiaries. UL listed for indoor and outdoor use, the sets average 2,500 hours for years of trouble-free lighting. Up to 5 sets of the 42-foot strings can safely be connected end-to-end. Bring the ho-ho-ho to your holiday decor with these bright, dependable, and economical lights.