Seaguar STS Fluorocarbon Leader gets to the fish faster and holds its own in a fight. This fluorocarbon leader is made with 100% fluorocarbon material, making it practically invisible in the water. Incredible impact and knot strength lets it hold up to greater pressure from fish. Seaguar™ STS Trout/Steelhead Fluorocarbon Leader is even designed with a fast sink rate to get to the fish faster.