Siet Wrist Trainer Ball Auto-Start Excerises arm Strengthener Essential Gyroscopic Wrist and Forearm Exerciser Wrist Ball for Stronger Muscle and Bones Workout

✔Good for Health：This power wrist ball not only increases strength in fingers, wrists, hands, forearms, biceps, triceps, ligament and shoulders, but also be a very effective tool release soothe wrist pain, numb hands and damaged limbs, or help reduce the inflammation caused by arthritis. Also be beneficial in promoting co-ordination and blood circulation
✔LED Flash Add Fun to Exercise ：With the novel design of LED lights, you can see how fast the rotation speed is. When rotating, the LED lights up. The faster the rotation, the brighter the LED light. LED lights is not powered by batteries, powered by rotating the wrist. Now rehabilitates sore muscles, kill the time and add fun!
✔More Safe and Eco-friendly：The silicone grip non-toxic, hypoallergenic, and it can be contacted your skin directly. Steel axis, not easy to deform and break. The unit did not have any weird vibration to it. Also having the silicone grip section helps with the gyro ball not coming loose from your hand