Features: High quality material: made of high quality PVC with smoothing and burr-free edges, reusable and durable. Increases lung capacity: It can increase lung capacity, effectively improve lung permeability, reduce breathing difficulties. For strong lungs: The device works the lung muscles, increases lung capacity and improves breathing problems such as asthma and breathlessness. Continuous and reliable work keeps the lungs health and strong. Practical: helps you to promote the removal of mucus, helps you to breathing better, opens your airway lungs and improves lung ventilation. Portable: it is light weight, portable and easy to handle. No electricity or water is required, making it easy to clean and maintain. Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Material: PVC, ABS Size: As shown Package List: 1 x Mucus Clearance Device