The Hi5 PC Wrist Power Ball is designed to help muscle training from the wrist to the elbow: fingers, wrists, forearms, upper arms, biceps, triceps, and shoulders, effectively improving arm strength and flexibility.
The Wrist Ball has an auto start design and comes with an elastic device inside; pull the ball core along the arrow till the end, loosen the ball core, then start the rotating. How to start the wrist ball: Gently press the center of the ball with the thumbs of both hands and push it in the direction of the arrow Quickly release the ball with both thumbs and give the ball to the hand hold-ding the ball When you feel the force of the sphere rotating, rely on the power of the wrist to swing from side to side or in a circle, and continue to accelerate with your hands until the variable speed lights flash
The PC wrist power ball is gravity adjustable allowing you to control the rotate speed of ball core-spinning at up to 20,000+ RPM. It is noiseless and has double safe protection; it has a skid-proof silicone loop and a wrist rope design to prevent tossing out of the ball. The ball core is made of alloy and the ball shell is made of environmental PC material for better shock resistance. The LED light inside will be shinning when rotating to get more fun in training.