HALO Fluorocarbon ~ the first Co-Fluoride in the United States.The union of unmatched proprietary extrusion technology, coupled with the finest raw materials available.The next generation of fluorocarbon fishing line combines the unique characteristics of different fluorocarbon crystals to give anglers the best combination of strength, sensitivity, and castability in the best all purpose fluorocarbon line available.100% pure fluorocarbon with a low refractive index making it invisible underwater with a greater specific gravity, for a faster sink rate.