Flow Regulators -Breathing Exerciser Mouthpiece Highlights Generic Brand Breathing Exerciser Mouthpiece Description: High quality food grade silicone material very safe, soft and comfortable Designed to increase your stamina and improve your lung capacity. Also help to easily and quickly strengthen the abdominals of the respiratory muscles, increase your respiratory endurance. Helps you inhale more volume of oxygen into your lungs and exhale more carbon dioxide. The adjustable resistance dial allows you to adjust the resistance according to your own physical condition Specification: Material:Silicone Size: 21x12x3.5cm/8.26x4.72x1.38inch Package includes: 1 Breathing Exerciser Mouthpiece piece (pack of 2)