Shake to make the ball wobble around Plays silly sounds while it shakes Multiple textures and bright colors to stimulate baby's senses Nothing gets the fun shakin' like Oball's Wobble Bobble! Babies absolutely love this vibrating ball that rolls and wobbles across the floor in a different direction every time - causing baby to chase after it. Bold colors and shapes add to it's entertainment value. Babies love to pick it up and carry it as it jiggles in their hands. This is one toy that will keep baby laughing!