A new sensation shad tail worm that swings a flat body with a volumey flat body at a high pitch with a tail that generates powerful wobbling. Innumerable block-shaped ribs are arranged on the body, which has the effect of generating a complicated turbulent flow and at the same time making it difficult for the threaded bath to cut off. It has evolved from the "trailer assembly model" that was released in advance, and it has become possible to perform stable swimming while maintaining powerful tail action even in no sinkers and nail rigs with offset hooks. Of course, even in the trailer of rubber jig, swimming with jig head, etc., the overwhelming appeal power attracts the bass.