Item Type: Wrist BallProduct Material: ABSProduct Specifications: Black With LightsProduct Use: Fitness Grip BallProduct Size: Approx.Height: 55mm / 2.2inDiameter: 70mm / 2.8in .wang-edit-text{ font-family:Arial important; } .wang-edit-text table { border-top: 1px solid 000; border-left: 1px solid 000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid 000; border-right: 1px solid 000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; } 1Function: Good for promoting blood coordination and circulation, strengthening fingers, wrists, forearms, shoulders and biceps. 2Portable Lightweight: This gyroscopic hand ball is small and lightweight, can be carried with you, no burden, convenient to exercise anytime and anywhere. 3Injury Rehabilitation: It is very suitable for the rehabilitation of hand injuries, such as carpal tunnel, gout, rheumatoid arthritis, osteoarthritis, fracture, subluxation, dislocation, sprain and strain. 4Endurance Improvement: Impressive warm up equipment improves the endurance of fingers and ligaments, and strengthens hand strength. 5Safe: Special wrist rope for protection and safety. Put on a special wrist rope when using it so that it will not be thrown out due to too much force when playing, which is safer.