NEW JIN BD Wrist Trainer Ball Auto-Start Wrist Strengthener Gyroscopic Forearm Exerciser Gyro Ball for Strengthen Arms, Fingers, Wrist Bones and Muscles, Black

• Automatic start design, need to push the core in the direction of the arrow, start by the internal spring, very easy and convenient.
• When it rotates, the cool colored lights inside will light up. It can kill time and add fun while restoring muscle soreness.
• Without any strange vibrations, it can rotate for a long time without worrying about it stopping when moving.
• The convenient design can be carried anywhere, whether in the office, gym or at home, it can be used as a toy to decompress at any time, and it can also exercise arm muscles.
• Wrist ball can promote blood circulation and increase the strength of fingers, wrists, hands, forearms, biceps, triceps and ligaments and shoulders, and restore muscle strength.