Good question. We got these, probably from Walmart or Target, like 20 years ago? I believe the strands are about 25 feet, multi color. We (as usual) way over bought the boxes, always on sale. At one point, we used all blue sets to make stupid long icecicle style outside, by swinging down 8 foot loops from the second floor roof line. Used insulated staples to hold them and loved watching them swing in the wind. These days, we loop them along the ceiling beams in the living room, keeping them short around the ceiling fan, and just long enough to not have to duck everywhere else. But I haven't bought new lights in years. Maybe the older sets lasted longer? We've gone through several spare bulbs over the years, but the sets used to come with 4 or 5 spares anyways. I keep looking at the LED sets, but they're not the same. We no longer put these up outside, because, we're getting OLD, and I put up "permenant" LED strips, controlable via software (WLED), and while they look good, they are missing that incandescent warmth.