Toho UV Beads

 Due to ultraviolet rays, which are easy to penetrate even in water, it is easy for fish to see and develop color at the wavelength they prefer. Since it is a soft type, it can be detached from the tip of the hook.
It also has a float effect because it is buoyant. Various approaches are possible, such as combining with other beads such as luminous balls.

Both hard and soft are size 4