Since it can be dropped even at a depth of 30 cm, it will appeal to the buses and earn a bite chance. The salt-in body with its own weight is easy to throw even in strong winds, and the action at the time of fall is finished in a tight horizontal fall with a slight earthquake. In addition, we adopted a material that is reputed to be caught by fall crawler and crawler, and realized the generation of deep bite by the synergistic effect of shape design and action.