The thin arm is deformed and hooking is not decided. The thick arm makes it difficult to transmit the vibration of the blade to the body. Bt Spinnerbait Swagey solves such a dilemma. Due to the processed Bt arm, the lower arm with a diameter of 0.95 mm realizes toughness that is hard to deform. The 0.6mm diameter upper arm transmits the vibration of the blade to the entire body, giving the skirt a glossy action. Tin and tungsten are used for the head. By concentrating tungsten, which has a high specific gravity, on the bottom surface, it stabilizes swimming even at high winding speeds such as gargle ringing and buzzing, and around the cover, it reduces rooting by the quick rise after avoiding obstacles.