Add a new element to their routine with the Tranquility Baoding Balls. These beautiful marble balls have been used for centuries in China as a form of hand exercise. Rotating them around in the palm is not only strangely satisfying but also great for building dexterity and coordination. For an extra challenge, try using them with your eyes closed! These balls come with a drawstring bag for easy storage, making them the perfect way to take their new practice wherever they go.