Seaguar Tatsu 1000 20LB has extraordinary knot strength and castability. TATSU - Japanese for Dragon - delivers an amazingly strong, yet supple, flourocarbon line unlike any other through a superior, state-of-the-art double-structure process. It fuses two custom, 100 percent flourocarbon resins, creating the world's only double structure main line. Fill your spool with TATSU and fish fierce.