Chinu's jig head rig represented by AR rig has been established as a fishing method that is now indispensable. The key is to capture with a bottom knock, which is based on the image of small crustaceans that Chinu preys on. And if technology evolves, it is inevitable that tools will evolve naturally. Amajaco was developed as a worm exclusively for Chinu that is highly effective when combined with an AR rig. The high effect is all told by the actual fishing results in repeated field tests.