Feels good and helps keep your hand muscles, limber, flexible, strong and busy. Proven to improven to improve range of motion of joints, improve muscle performace, strengthen finger muscles and rehabilitate hand muscles and joints. This twistable therapy device is a new ergonomic approach to stress relief, as well as a manipulative for hand therapy. 20 interconnected twistable pieces made of ABS plastic covered with a soft, latex free rubberized material. Uses fine motor skills and is a great stress relief item.