This tool works much like the Bonger. It provides an invigorating percussion-like massage called tapotement which improves circulation, eases muscle tension, and even reduces the appearance of cellulite. Body Back Sticks are kind of like a meat tenderizer. Use one or two simultaneously. By tapping contracted and knotty muscles you can release tightness and relieve pain. Take this tool anywhere for quick relief of back pain, headaches, and tired, sore muscles. Fun and easy to use on yourself and your friends.