The item is a leader that is featured in its tenacity even to predator fishes, even in rocks, and in fight with fish. Damage to the line can be optimized. Original low extension design can be fully applied for a perfect transfer of movement to jigs or lures to hook a fish. Even of its fluorocarbon nature, it can stand for a big shock due to its smooth and tenacious features. And knotting with this leader brings a much better experience. Parallel spooling is adopted to decrease line surface damages.