Eco-friendly material: This abdominal breathing trainer is made of eco-friendly ABS resin and TPR material, which is safe and healthy for human body. When breathing with a respirator for a long time, it can tighten the skin of the jaw and improve the jaw line. Increase lung capacity: Due to its special design, the breathing exerciser can increase lung capacity and increase energy expenditure through abdominal breathing. VERY PORTABLE: The breathing training device is designed to be small and lightweight, allowing you to take it with you and use it anytime, anywhere. Holiday Gift: The lung exerciser is powerful and performs well and can be used as a holiday gift. The unique design of this sneaker will delight the recipient of the gift. 1. What this abdominal breathing trainer can offer you is that it can exercise your mouth to improve your lung capacity and reduce your fat belly while also correcting your breathing and posture. 2. Produced with high elastic texture, long service life, mini compact size allows you to carry it with you for outdoor use. 3. Made of ABS and TPR material, this breathing fat-reducing trainer has elasticity and soft feeling to use. Size: 11x5cm