Wide range of usesStress 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 timepatient 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. Ergonomic designThe grip training ball adopts an egg-shaped design, which is more comfortable to hold in your hand. The ergonomic design can be used to exercise your hands anytime, anywhere, Whether at home, traveling or going to work. Safe and easy to clean The grip training ball is made of thermoplastic rubber (TPR), which is safe and tear-resistant. It can be squeezed and rubbed repeatedly and can be restored immediately. It may be dirty after playing for a long time, you only need to rinse with warm water and detergent. After it dries naturally, wipe with talcum powder just like new. NoticeOur grip ball is slightly harder in texture, which is good for exercising hand strength and hand rehabilitation training.