Medical 3 Balls Spirometer lung exerciser is a powerful tool for respiratory training and rehabilitation. This product features three different balls of different colors representing different levels of difficulty that can be adjusted to meet the user's needs. By blowing into the mouthpiece, this lung exerciser provides an effective pulmonary workout that strengthens respiratory muscles, improves lung capacity and enhances overall respiratory function. As a factory, we assure you the highest quality standards and excellent customer service. We stand behind every product we manufacture and assure you of its quality and durability. With this product, you'll experience the benefits of a complete exercise regimen that aims to improve your respiratory health and well-being.