Uses polyester material with low elongation and high sensitivity design. Maximizes thread strength, with little elongation, so you can catch even the smallest bites. Minimizes quirks and achieves high operability. Lightweight jig heads can be cast without stress. Specific gravity of 1.38 covers the middle layer of nylon and fluoro. Expands the range of attack. Uses natural color that does not make fish wary in the water.