Self-starting Counting Wrist Ball Fitness Gyro Centrifugal Power Badminton Training Grip Ball

Product information:
Adjustable speeds: 6,000 RPM, 8,000 RPM, 9,000 RPM, 10,000 RPM, 11,000 RPM, 12,000 RPM, 20,000 RPM
Ball core material: Zinc alloy
Shell material: Polycarbonate, silicone
Dimensions: 70 x 70 x 50 (mm