The Yoga Tune Up Therapy Balls are made of a special rubber that grips at your skin, grabs at multiple layers of muscles, and rubs out adhesions and tension, providing a deep tissue massage. The Yoga Tune Up® Therapy Balls with Tote set includes two foot massage balls and a mesh drawstring snug-grip tote bag. Perfect for mamas to self massage and self soothe achy areas in the body.