Wrist ball will give your hands, wrists and forearms a workout with resistance training. It can develop and shape your grip and forearm muscles to improve baseball, tennis, golf games and most sports. Burn fat and get rid of flabby arms. It may help prevent and relieve repetitive stress induced injuries like carpel tunnel syndrome, tendonitis. Wrist ball is a compact, simple way to isolation exercise without having to go to the gym. Lightweight, portable and perfect for traveling. It’s a great gift for anyone with no time to work out.☞☞Specification:Name: Wrist Force Centrifugal BallMain material: polycarbonate, zinc alloySuitable for: fitness enthusiastsPacking 1: Wrist ball*1, boxing ball*1Package 2: Wrist ball*1, leg exerciser*1Package 3: Wrist ball*1, resistance device*1Package 4: Wrist ball*1, leg resistance device*1☞☞ How to use:1. Push the thumbs of both hands in the direction of the arrow of the center of the ball until the resistance is large and the center of the ball cannot roll.2. Quickly release the core of the ball with the thumbs of both hands, and turn the ball by the hand3. After feeling the sphere rotates, swing the ball from left to right in a circle-like way to slowly rotate the wrist ball, and the speed can be increased with the inertia☞☞Service:1. If you need more styles, please click our other products to find the style you want.2. If you have any questions before or after your purchase, please do not hesitate to contact us.