Make your treetops glisten when you decorate with blue incandescent mini Christmas lights. The bulbs are spaced 6 inches apart on green wire, so they are ideal for decorating trees, house trim, and outdoor displays. UL listed for indoor and outdoor use, the strings average 3,000 hours of trouble-free lighting. Up to 10 sets of the 25-foot strings can be safely connected end-to-end. Let these lights bring sparkle to your holiday or year round lighting design.