【Wide range of uses】Stress balls can train arms and wrists as hand grip strengthener balls, strengthen hand exercises, and relieve joint pain.Help the injured do rehabilitation training ,divert attention to change some bad habits and relief stress .
【Applicable to a wide range of people】 The grip training ball is suitable for office workers who need to type for a long time，patient who need rehabilitation training after injury and also suitable for sports-loving people rock climber wrestler or softball pitcher etc. Suitable for children, adolescents, all ages, including the elderly.
【Four resistance levels】 The grip training ball set includes four balls, with four resistance levels: 13kg (yellow), 20kg (orange), 30kg (blue), and 35kg (green). Different people use different colors for different purposes. For example, yellow balls can be used for children and the elderly.