Strengthen your hands, wrist, forearms, biceps, triceps and shoulders with the Gyro Powerball. The Powerball is a one-pound gyroscope that can produce up to 35 lbs. and 18,000RPM's of impact-free resistance. It helps increase blood flow and improves dexterity in your hands and arms, while helping you recover faster from sport injuries, surgeries or RSI. This small, lightweight device can travel with you in your car, gym bag or purse, so you can use it anywhere and anytime!