"Excellent material: Made of high-quality wood and foam balls, it is safe and harmless, with exquisite workmanship, firm and reliable, and can be used for a long time.Size: 1 set, including 1 wooden lung breathing trainer and 2 balls. The size is about 14 * 4 cm / 5.51 * 1.57 inches. Small size, light weight, easy to use.Safety design: The surface of the trainer is smooth and polished, without burrs or cracks, and will not scratch hands or lips, making it safer for children to use and parents more assured.Lung capacity exercise: The blowing ball breathing trainer allows children to increase breathing endurance and lung capacity by exercising respiratory muscles. At the same time, let the children know that gas can keep the balance of light objects during exercise, experience the charm of physics, and cultivate interest.Wide range of uses: suitable for family games, school teaching and outdoor entertainment, it is the best gift for children."