The SGravityy (surf, gravity) shad worm is a worm that comes standard with SG heads. Unlike conventional worms, the ring-shaped surface increases the contact area with water, and the surface tension is increased to give water entanglement and buoyancy, suppress fall speed, and generate waves firmly during swimming. Designed to appeal to the target. The Yamagata Shad Tail in the tail part emits a large wobbling wave, conveys the shaking of the wave from the body to the head, enhances the flushing effect of the plug head, and improves the sense of unity and appeal of the head and worm. A guide fall is provided in the center of the body, and it is designed so that anyone can easily install it without the worm keeper coming out of the head shifting.