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Automatic start: The upgraded version uses a built-in pre-tensioner to start , and no starting rope is required. Press the inner ball with your thumbs and move your thumbs in the direction of the arrow to start the internal spring. The working principle is simple and environmentally friendly. By rotating the wrist, the ball core rotates at high speed, generating centrifugal force, which makes the wrist feel a certain resistance.

Suitable for assisting: Long-term use of computers or mobile phones, carpal tunnel syndrome, repetitive stress injuries, etc. are more common. By continuously and indirectly strengthening the muscles and flexibility of the forearm and wrist joints, it can significantly improve muscle strength, flexibility, and promote blood circulation.

Sports Assistance: It is beneficial for grip training, fitness, golf, tennis, rock climbing, cycling, cricket, martial arts, etc. It has an auxiliary effect on improving finger grip and grip strength.Arm Balls improve blood circulation and strengthen fingers, wrists, hands, forearms, biceps, triceps, ligaments and shoulders

Quality Assurance: Torsion Ball is rigorously tested by factory machines, warehouse inspections, and manual re-inspections. This product does not require battery power. Wrist rotation interacts with the internal ball core to generate centrifugal force to maintain efficient rotation. The faster the rotation speed, the greater the force generated.

The product includes: wrist ball, ball bag, safety rope, instruction manual, gift box,If the wrist strength ball you received cannot start smoothly or operate normally, please contact us in time, we will help you solve the problem and teach you how to use it properly.