Features- Improve finger strength for athletes (basketball,rock climbing enthusiasts, 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. -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. You can get repetitions in while commuting, at the office or anywhere-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. -For physical therapy and stroke patients, the different balls are used daily to restore range of motion.Specification:Color: Green,Blue,,Orange Material: BPA free silicone Size: 9.5cm(3.74in) 7.5cm(2.95in) 0.6cm(0.24in) APPROX Quantity: 1pcPackage includes:1 Silicone Finger Trainer