Ergonomic Structure:Featuring a hollow arc-shaped top and palm-contoured Structure, this tool generates consistent vibration with small hand pressure. Reduces discomfort caused by traditional methods while optimizing comfort and daily care routines Multi-Scenario Versatility:Dual-size set accommodates children, adults, and seniors. Ideal for active lifestyles swimming, diving or vocal training, it assists with managing respiratory congestion during extended rest periods by supporting the body's natural clearance process Flexible & good Material:Crafted from premium silicone with high elasticity, it maintains shape after repeated use. Gentle tapping creates soothing pressure waves to assist in loosening congestion while ensuring even force distribution Effortless Portability:Lightweight construction with anti-slide grip allows single-handed use. Requires only 5-10 minutes daily. Compact size fits effortlessly into bags for home, travel, or on-the-go use Hygienic Maintenance:Seamless Structure eliminates crevices for thorough cleaning. Reusable material withstands frequent washing, making it a sustainable choice for ongoing wellness routines Ergonomic StructureThe hollow arc top fits the palm, the uniform vibration is effortless, the use is comfortable and the hand is acid resistantDouble size fits the crowdChildren/adults double size, suitable for different body types, long sleeping, sports and vocal people suitableFood grade silicone materialHigh elasticity without deformation, soft to touch and easy to clean, Sturdy without odorPortable, light and easy to operateSingle hand 5-10 minutes to complete, small and portable, home travel can be usedPackage included:1 x Chest Percussion Cup-S1 x Chest Percussion Cup-L