Auto-start Wrist Ball Wrist Strengthener And Forearm Exerciser For Stronger Arm black Good for Health: Effectively recovers wrist pain, humerus fracture, scaphoid fracture, radial head fracture, finger numbness, hand numbness, wrist fracture, elbow tendinitis, bone fractures, olecranon bursitis. Increases strength in fingers, wrists, hands, forearms, biceps, triceps, ligaments and shoulders. New design with LED: New design with LED light, it's fun to see how fast you can spin it. The cool LED light inside lights up as it rotates, requiring no batteries and is powered by a twist of your wrist. Rejuvenate sore muscles, kill time and add to the fun! Easy to use: Compared with the old version that needs to be started with a rope, our upgraded version is an auto-start design that can be easily started by rotating your wrist. HIGH QUALITY: The unit does not have any weird vibrations. The silicone grip part is also really nice as it helps the gyro ball not come loose from your hand. Suitable for sports training: Very beneficial grip trainer, suitable for golf, tennis, rock climbing, cycling, basketball, cricket, martial arts, and improve the performance of pianists, drummers and guitarists. Package includes: One wrist ball Note: 1. Please allow some errors due to manual measurement. Please make sure you don't mind before bidding. 2. Due to different monitors, colors may vary, please understand. Hello, please pay attention to your shipping address when purchasing products. If your delivery information (such as name, street, house number, doorbell/box without name, etc.) is incorrect, the order will not be delivered correctly. )