Breathing lung expander Made of high-quality silicone material, non-toxic, no odor, harmless and environmentally protection, you can use it with confidence.
Improve durability of breathing and shortness of breath, and provide 100% adjustable resistance for inhalation and exhalation.
Lung exerciser device size about 9.5 * 5.5cm/3.74*2.16in, light and small, convenient for you to carry.
Our lung exerciser device are durable and easy to use. It fits all mouth shapes, can be sealed perfectly, comfortable to use.
Suitable for many occasions such as swimming, diving, surfing, running, fitness, travel, etc. Our products are durable and easy to use. It fits all mouth shapes, can be sealed perfectly and is convenient to use.