The product is high elastic, its size can be extended. By uisng the silicon finger bands, you can not only stretch the muscles in your palms and wrists, but also strengthen the individual fingers. The hand yoga's ergonomic design allows it to be a perfect device for rehabilitation purpose aswell as for baseball players, golfers, tennis players, surgeons, mechanics, musicians, keyboarders, and so on.The professional design is for fitness club, home or gym center.