Features: Get rid of mucus in the lungs easier - special hollow arc cover and ergonomic design. chest physical therapy (cpt), or postural drainage and percussion helps loosen the bond of the mucus to the airway walls and helps push the mucus up and out of the body, helping the body’s natural mucus clearance process. Quick & easy, this device is quick and easy to use, with most people only needing up to 5-10 minutes, 1-2 times per day. will assist break up mucus for the following people: children, adults, elderly, smokers, swimmers & deep sea divers, athletes, singers, wind instrument musicians. Professional grade, the high-end quality of this chest percussion therapy cup is used and recommended by professionals. it is perfect gift for you loved one who need remove mucus. Material,silicone material, high elasticity, long with no deformation, uniform force, feel comfortable. it help provide uniformity and consistency from one user to the next. Easy to carry, it is designed as light weight and portable size, making it easy to carry around. you can just keep one at home and another at bag. it is a comfortable size for kids, adults, elderly. Specifications: Material:Silicone Color:Clear,Purple,Gray,Blue Crowd:Adult High:6.5cm/2.56inches Diameter:10.1cm/3.98inches Package Includes: 1 Piece Pressure Drum Massage Cup note: Please allow 1-2cm errors due to manual measurement,pls make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.