Use high-quality material,harmless to health and safe to use. Our device is sturdy and wear-resistant can be used sustainably.It is easy to use and to get started. With the detailed instructions, even the first time use can achieve the expected usage effect.Our device can help you to improve the breathing muscle strength, stamina, and reducing breathlessness, which can strengthen your lungs function against pneumonia, asthma, and other lung attacking viruses.3 color coded balls for differing inhalation rates - from 600cc/sec, 900cc/sec, 1200 cc/ sec. Adjust the intensity of breathing exercise according to your own situation.The mouthpiece and tube can be freely disassembled and assembled for easy cleaning. After use, please place it in a ventilated and dry place to maintain the cleanliness of the device.[Type A] Height 14cm, width 13.5cm, gas capacity 600-1200CC[Type B] Height 14.7cm Width 14.5cm, Gas Capacity: Blow 600-1200CC, Suck 1000-3000CC