By using the hand grip balls and finger stretchers to improve hand strength, finger dexterity, joint flexibility. These also can be used to assist injury recovery, ease muscle pain, and relieve stress Release daily stress for those sitting to work for long hours or with daily pressure.Suitable for all ages from teenager and above Progressive Resistance Progressive Resistance with different colorWide Applications: The hand exerciser kit is ideal for athletes who play baseball, tennis, golf, boxing, and fitness, for outdoor adventurers who love rock climbing and bodybuilding, for musicians playing piano, guitar, bass, and violin, and for people with daily stress. A unique shape: Great gift for any loved one, friends, colleagues, family rich in your daily life. Safety: With ergonomic design and unique textured surface, perfectly fit your hands. After repeated compression, it can still maintain its original shape, easy to clean and dry with a cloth, durable and safe. Portable kit: This kit is suitable for anyone to exercise the hands at anywhere no matter you are sitting at home watching TV, walking on the way, or in a lunch break in the office. Quality Material: The exercise balls are made of high-quality thermoplastic rubber (TPR) and food-grade silicone, which keep it's original shape after repeated squeeze and stretch.