2 kinds of therapy balls for different functionality. Purple ball with longer nibs is great for small muscles including feet, hands and small areas that needs perking up. Green ball with stubby nibs is for large muscles. Both textured balls offer immediate muscle relief from fatigue. Sensory spikes that act as mini acupressure points Provides a kneading effect resulting in deep muscle release Enhance blood flow and promote healing of affected area Can be used alone or with a partner
