The spiky massage ball is a great sport fitness product where focus can be centered on different trigger points of the body such as the hands, feet and the foot pain and great for foot pain stress relief. Muscle Relax Ball. Great for massaging your palms, feet, ankle, shank, arms, neck and back, etc. A simple massage tool which can help relieve muscular tension, promote blood circulation. With a diameter of 7cm, it can be put in the pocket when not used. Come visit our store to see more. Make sure to use the code FIRSTORDER for a 10% discount.