Hi-Seas 100% Fluorocarbon Line is extruded under strict quality control standards using the highest quality pure polyvinylidene fluoride. This results in a fluorocarbon that matches the refractive index of water - making it nearly invisible. Also extremely supple and easy to fish, Hi-Seas 100% Fluorocarbon is abrasion resistant and sinks faster than monofilament, so it won't affect the natural fall of a bait.