About this item

• The product includes: JIN BD wrist ball Black without LED lights, brand card, ball bag, safety rope, instruction manual, gift box | Start-up method:This upgraded version features a built-in pre-tensioner for activation-no starter string required. Simply press the inner ball with your thumb and move it in the direction of the arrow to engage the internal spring. The mechanism is simple and eco-friendly. As the wrist rotates, the core spins at high speed, generating centrifugal force. The faster the spin, the greater the resistance, allowing the wrist to experience an effective workout. | 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. | Suggested Reminder: If this is your first time using the product and you still have questions or difficulties after watching the built-in instructional video, please contact customer service promptly. Our support team will assist you in real time and provide the necessary help and support. | Exquisite Design: The Wristball can be carried anywhere, whether in the office, gym or at home, it can be used as a toy to relieve stress at any time, and it can also exercise finger grip strength training. | A chic gift: The gyro ball is a great gift for children who love sports, restless middle-aged people and people who work in the office for a long time, guitarists, pianists and other musicians | Quality Assurance: JIN BD 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. | Tips: If the wrist strength ball you received cannot start smoothly or work properly, please contact us in time, we will help you solve the problem and teach you how to use it correctly.