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improve finger strength for athletes (basketball, fitness, tennis, baseball, boxing, tennis, golf and shooting) and musicians (guitar players, bass players, pianists and violinists). -help prevent injuries and muscle imbalances from the overuse of "crushing" type hand and finger grip exercises. -portable, durable, no odor, no stains, no edges, no noise, easy to use. exercise kit for seniors, to -provide physiotherapy and therapeutic rehab to find relief from a life time of knuckle use. -of the "squeaky" noise some some traditional grippers make so that you don't disturb anyone around your and most importantly for your own sanity -the strength trainer is ergonomically designed and fits well for all hand sizes, which perfect for men, women, seniors and teens. it is great to fit into your gym bag or handbag..syi