The Massage Ball from Sensory Sensations are spiky massage balls that are used to relieve muscle tension, by stimulating blood flow to promote relaxation and circulation. It can also be used as a sensory tool, to stimulate the skin and muscles simultaneously. They are used for relaxing muscles, reducing tension, and stimulating tired muscles. They are perfect for body massages and to promote blood circulation. The spiky nubs on the ball provide for massages, sensory therapy and relaxation exercises.