Features: Strength training of respiratory muscles reduces shortness of breath and increases lung capacity. Small and compact, can be carried with you. Almost anyone can use it without side effects. Strengthen your respiratory muscles and abs with our breathing and lung exerciser device, ultimately enhancing your overall performances. The adjustable resistance makes the simplest task more difficult, and can exercise more intensely according to your needs. Specifications: Material:Silicone Color:Black,White Size:Approx.5cm/1.97''x10cm/3.94'' Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Breathing Exerciser