The Triple Fish Fluorocarbon Leader 25yds 50lb Test is completely 100% polyvinylidene fluoride. This type of leader is virtually invisible under the water and matches the light refractivity of the water. This fluorocarbon leader has a faster sink rate than monofilament, as it is heavier. This leader will hold up as it is much more abrasion resistant than monofilament and holds up well to chaffing. This fluorocarbon leader is great quality and is priced at a great value.