Bullet Points: 1Improve Your Endurance: Breathing Exercise for Lungs is helpful to improve your breath, helps you get better endurance, and makes you feel better day by day. 2Functional and Effective: Lung Exerciser Device strengthens your lung capacity and helps you adjust the abdominal muscles, therefore allowing you to exercise core muscles. 3Adjustable Resistances: Deep Breathing Lung Exerciser is designed with adjustable resistances, allowing you to find the right resistances level for your training and adjust accordingly. 4Improve Body Performance: Breathing Trainer for Lungs can help you build up your breathing and abdominal muscles, therefore enhancing your overall performance. 5Lung Capacity Improvement: Lung Endurance Trainer is helpful to decrease the accumulation caused by body waste, helping you greatly increase your lung capacity. Description: Breathing Exerciser for Lungs helps you improve your endurance, exercise breathing and abdominal muscles, and decrease the accumulation caused by body waste, therefore strengthening your overall performance. Specifications: Product Name: Breathing Trainer Size: about 5*10cm/1.97*3.94inch Material: Silicone, ABS Weight: about 68g Use: Aerobic exercise Packing List: 1pcs* Lung Capacity Exerciser Device Notes: 1. Due to the lighting effects and photographing angles, there is a color difference in the product, please understand. 2. Due to manual measurement, there is a tolerance in the product size.