The Acu-Reflex Massage Ball has hundreds of sensory nodules that act as mini accupressure points when when rolled along the body. This tool provides a kneading effect resulting in deep muscle release and increased blood flow to the affected area to promote healing. The Porcupine Massage Ball is small enough to take with you and use anywhere. Keep one at home, and another at work or school. Easy and fun to use on yourself or on a partner.