This is a punching ball that is fixed at the top for use. It's perfect for boxing, kickboxing, MMA, martial arts, or other punching training. Punching the ball is effective for tightening both arms. It is especially effective for tightening the deltoids (sides of the shoulders) and the triceps (back of the upper arm). This exercise is not as intense as training with a heavy bag. Therefore, it is more effective for tightening than for building muscle strength. It's a gentle exercise method that builds lean muscle and burns fat. The effects include: 1. Ability to throw accurate punches. 2. Development of rhythm (important not only for boxing, but for all martial arts). 3. Increased muscular endurance in the shoulders. 4. Ability to throw rapid combinations. 5. Development of dynamic visual acuity. ■ Size: Approximately 30cm in height, approximately 17cm in diameter ■ Color: Black ■ Material: PU ■ Metal fitting mounting belt width: Approximately 1.5cm ※ Air pump is not included.