Berkley Trilene 100% Fluorocarbon Leader Material features a professional-grade formula that provides incredible knot strength excellent abrasion resistance and high-impact strength. This leader material has a similar refractive index as water so fish can't see it. It's also made with a proprietary 100% PVDF formula that's specially processed for the ultimate in impact strength. Tough and durable this abrasion-resistant leader material can really take a beating and keep on fishing. Berkley Trilene 100% Fluorocarbon Leader Material 25 Yds.