BONGERS are traditional massage tools in Japan. They're good for breaking down muscle tension and stimulating circulation. Most people store tension in their neck and shoulders, and that's usually where BONGERS are most effective. However, they feel good all over giving an invigorating, Shiatsu-like massage. Their flexible shafts do all the work, allowing the massager to BONGER indefinitely without trying. Sold in pairs - 2 to a box.