ESP Ghost Fluorocarbon 20m is a pure fluorocarbon hook link material, not simply a fluorocarbon-coated line. Its light refractive index matches that of water, making it virtually invisible when submerged. With a specific gravity of 1.78, rigs sink quickly and lie tight to the bottom, which makes it an excellent choice for wary carp in clear water. For best results, tension and smooth out the rig before use, and tie with a well-moistened five-turn Grinner knot to achieve maximum knot strength.