Seaguar® Fluorocarbon Leader Material Seaguar Fluorocarbon is known throughout the world for its invisibility, superior tensile and knot strength, abrasion-resistance and UV-resistance. The fluorocarbon construction will not absorb water like most monofilaments. And Seaguar won't inhibit the action, so your lure looks natural in the water. Because it's invisible, you can use a higher strength line for your leader without fish seeing it. Available in 25-yard spools.