Strengthens diaphragm muscles and develops breath control to help produce strong speech. Makes a game out of exercising deep lung breathing. Children can exhale or inhale to keep the ball at the top of the tube. Helps children with neurological or physical impairments or who simply lack adequate breath support. Deeper breathing helps sustain sounds and promotes stronger speech. Two tubes for different levels of exercise, instruction sheet. Nontoxic, dishwasher-safe. Colors vary.