1. PCTG+PMMA material, safe to use 2. Effectively trains lung capacity, abdominal muscles, core muscles, and more 3. Designed to increase lung capacity and improve breath control, this breathing trainer is ideal for anyone who needs deep breathing exercises 4. Wide range of resistance levels, quantified by weights, allowing for direct visual feedback 5. Non-oral, avoids masseter muscle stimulation and is completely washable 6. Easily train all muscles and strengthen your core in just five minutes a day 7. Adjustable weights allow for flexible weight adjustment, allowing for different workouts 8. Compact and storable, suitable for any location: sitting, lying, or standing.
