Improve the finger strength of athletes (basketball, rock climbers, fitness, tennis, baseball, boxing, tennis, golf, and shooting) and musicians (guitarists, bassists, pianists, and violinists). Help prevent injuries and muscle imbalances caused by excessive use of”squeeze” hand and finger grip exercises. The strength training device is ergonomically designed, suitable for all hand types, and is very suitable for men, women, the elderly and young people. It is perfect for putting in your gym bag or handbag. You can get repeats on the way to and from get off work, in the office or anywhere! Portable, durable, no peculiar smell, no stains, no edges and corners, no noise, easy to use. The elderly exercise kit provides physical therapy and rehabilitation, freeing you from the life of using knuckles throughout your life. For physical therapy and stroke patients, different balls are used every day to restore range of motion. There is no”squeaking” sound from some traditional fixtures, so you will not disturb anyone around you, the most important thing is for your own sanity