★【SAFE AND RELIABLE MATERIALS】Our pectus excavatum vacuum bell are made of food-grade PP material, odorless, and BPA-free, so your family can choose with confidence. They are washable, easy to clean and maintain, and can be used repeatedly. ★【VACUUM SUCTION PRINCIPLE】Our pectus excavatum corrector adopts the principle of vacuum suction and pressure, using the effect of negative pressure to pull the collapsed sternum forward, so that the collapsed sternum is attracted and gradually recovers. ★【IMPROVE CHEST DEFORMITY】A corrector designed for Pectus Excavatum, suitable for adults and children, helps improve sternal depression and chest cavity depression problems, and enhances self-confidence and self-image. ★【PERSISTENCE IS VICTORY】Any physical correction requires persistence, chest wall deformity corrector non-traumatic correction, without the pain of surgery, and long-term persistence will make the effect more and more significant. ★【ATTENTION】Our suction cups are customized according to the size of the user's chest concave surfaces and the width between your two nipples. Please be sure to contact us and provide your measurement data before purchasing.