Provides an invigorating percussion- like massage called tapotement which improves circulation, eases muscle tension, and reduces the appearance of cellulite. 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 bongers to work indefinitely.