Abstract: An exercise, strengthening and therapy device for the hand, wrist and arm. An elastomeric disk-like body has a plurality of spaced apart apertures for receiving the thumb and fingers of the user. A convex enlargement extends from at least one surface of the body positioned inward of the apertures. The enlargement may be spherical, semi-spherical or other curved configuration. In use, the device is inserted over the ends of the fingers and the thumb. In a preferred embodiment the device is integral, and in another the components may be disassembled and used separately. Exercise, strengthening and therapy benefits are achieved by flexing the fingers against the elastic resistance of the body and by alternately compressing the elastomeric projection within the palmar surface and fingers.