1?��??Multifunctions??Firstly ,hand grip strengther balls can train arms and wrists, strengthen hand exercises, and relieve joint discomfort. Secondly, it helps people to concentrate, relieve anxiety and tension, and release stress. Thirdly, prevent diseases, help the injured recover and divert attention to change some bad habits. 2?��??5 Resistance Levels?? The grip training ball set includes four balls, with four resistance levels: 15kg (yellow), 20kg (orange),25kg (red), 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. 3?��??Ergonomic Design??The 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. 4?��??Safe and Easy to Clean?? The grip training ball is made of 100% high-quality thermoplastic rubber (TPR), which is safe, tasteless and tear-resistant. It can be squeezed and rubbed repeatedly and can be restored immediately. It may become dirty after playing for a long time. At this time, you only need to rinse with warm water and detergent. After it dries naturally, wipe with talcum powder just like new. 5?��??Widely Applicable?? The grip training ball is suitable for office workers who need to type for a long time, and also suitable for sports-loving people, adolescents with anxiety, high tension, inattention, children with ADHD, and injuries after postoperative rehabilitation. Suitable for all ages, including the elderly.