1. Material: PU
2. Use nylon paste, which can be adjusted according to itself
3. The hairband is super elastic, suitable for a head circumference of 48-63 cm
4. The fixed buckle can fix the rubber band, which is safe, firm and durable
5. Anti-fracture elastic rope, double extension, better elasticity
6. Different training balls correspond to different groups of people, making training more effective
7. The ball is highly elastic and easy to control
8. Ball weight: 20 grams
9. Ball diameter: 60 mm
