An aid to teach breathing techniques for both adults and children. Fantastic for speech and stroke therapy and rehabilitation. They can help improve lung power/capacity & facial/motor control. They are often used with stroke victims and patients with pulmonary and speech problems. Blowing at the right speed will flip the egg over changing the colors & helping the child to learn breath control. Teach swimmers how to blow bubbles and not drink water. Egg flips are the only piece of equipment in the Halliwick method of therapy.