Introducing our low-priced 3-ball spirometer adult breathing exerciser! Available in three sizes, 600ml, 900ml, and 1200ml, this lung exerciser is perfect for anyone looking to strengthen their respiratory system. Our factory produces high-quality products at affordable prices, making it accessible to everyone. This exerciser is perfect for those recovering from surgery, suffering from asthma or COPD, or anyone looking to improve their overall breathing capacity. Don't let breathing issues hold you back, get our 3-ball spirometer today!