The bright rainbow colored fascinating expansion ball is a fun toy for indoor and outdoor games. The ball becomes bigger when thrown and will rejoin when you catch it. If the ball falls to the ground or hits an object it will automatically decrease.Use the ball in a sensory setting for to demonstrate calming breathing techniques with children to release anxiety stress anger or fear.Dimensions: Each ball is about 11 cm expands to 24cm. Warning: Not suitable for children under 36 months. Small parts. Choking hazard. Adult supervision is recommended.