Material: Plastic Size: 350mAh / 13790.00" Color: As shown 1. Multifunctional breathing trainer, designed to improve lung capacity and cardiorespiratory endurance, suitable for fitness enthusiasts and those seeking to improve respiratory function. 2. Utilizing abdominal breathing training principles, it enhances diaphragm strength through resistance adjustment, effectively supporting core muscle development and body shaped. 3. Compact and portable, like a breathing dumbbell, it allows for effective breathing training anytime, anywhere, helping to build abdominal muscles and enhance athletic performance. 4. Suitable for chest and abdominal breathing coordination training, it also supports pelvic floor muscle development, making it particularly suitable for postpartum recovery and chronic respiratory system conditioning. 5. Scientifically adjustable resistance levels adapt to users at different stages of their training. Safe materials ensure a long-term, healthy training experience. Package Includes:1pcs breathing trainer