Product Name: wrist trainer ball
*1. Material: aluminum alloy+canvas+plastic
*2. Size: 7 cm(diam), 6 cm(height), 49 cm(cord length)
*3. Weight: 360 g
*1. Mechanical power, no power required. The centrifugal force is generated by the rotation of the wrist and the rotation of the ball inside to maintain the rotation of the core.
*2. Metal core, sturdy and durable.
*3. Variable speed lighting, bright and dazzling.
*4. The spring part is optimized for structure, pulling more smoothly and reducing noise.
*5. Compact and lightweight, portable and easy to store.
wrist trainer ball *1