"MetalSet of 2A set of two premium foam hand strengtheners can train your hands at the same time, perfect for athletes, fitness trainers, musicians, etc. and those who want to exercise their hands, wrists and fingers, for increasing the strength and endurance of fingers, hands and forearms.Sports Equipment and Injury RehabilitationGreat for improving strength and flexibility of forearms, wrists, fingers, hands, as well as muscle building, use hand strengtheners for rehabilitation and pain relief, perfect for recovery from hand injuries, arthritis, rheumatoid arthritis, carpal tunnel syndrome, tenosynovitis, fractures, carpal fractures and tendon surgery.Soft Foam Protects Your HandsWill other handles damage your hands? Our hand strengtheners use only the highest quality foam to ensure that your hands are protected from excessive pain.20-25LB ResistanceThis hand exerciser is suitable for the whole family and is a scientific and effective way to improve arm strength. It is recommended to perform 3 sets of exercises per day, adult men: 50-100/times, women: 30-70/times, teenagers: 30-50/times.Portable Design SizeOur grip trainer has a compact design that can be put into your pocket, handbag or gym bag, convenient to carry with you, handle size: 5.2 x3.65 inches"