The first and only nylon monofilament fishing line to physically change color. It's the "line-watcher's" line. You see it; the fish don't! Activated by UV light, this monofilament changes from clear to gold in sunlight - hi-vis above, clear below. Excellent shock strength provides strong holds under hard hooksets. This highly manageable line is outstanding for a wide variety of baits and techniques. Super strong and abrasion-resistant. 220-yd. spools.