Sprint's Egg Flips are great for speech/stroke therapy and rehab. They can help improve lung power/capacity & facial/motor control. They are often used w/ stroke victims and patients w/ pulmonary and speech problems. Blowing at the right speed will flip the egg over changing the colors & helping the child to learn breath control. Egg flips are the only piece of equipment in the Halliwick method of therapy. Packaged in pack of 10. Latex free.