Sound clear. Use Plastic balls or iron balls inside. Various color as your wish. Cheap. Can pass throw over fifty times Rattle boxShin Dorn have various squeakers. squeaky ball, rattle ball, colorful ball, iron bell, jingle bell, brass bell, noise maker, ball which make noise, toot, fistula, speaker, horn, sound box, Various reeds and various small pumps. Rattle ball materialPS + HIPS, we Shin ...