Hand-stitched in Germany, the leather-bound 650 gram Haptik Ball is designed to strengthen your muscles, improve coordination, and help relieve stress. Made from genuine leather and filled with iron granules, the Haptik Ball provides a satisfying tactile experience whether the ball is thrown, held, squeezed, or swung. The Haptik Ball can strengthen your hands, forearms, fingers, and connective tissues when used with a variety of simple exercises. Using the Haptik Ball can even improve circulation in your hands and fingers by providing a comfortable resistance, thanks to the iron filling.