The TriggerWheel provides trigger point therapy and myofascial release. It is especially effective at myotension junctions. Think of it as a tireless thumb - with a brain. Use the TriggerWheel around small, difficult areas such as the TMJ, occipital ridge, trapezius, parascapular, pectorals, elbow, wrist, knee and ankle. The TriggerWheel locates trigger points the way an automobile discovers a speed breaker. Once the trigger point is located, a gradually deeper back & forth rolling pressure releases the reflex mechanism- and the contracted muscle relaxes. When muscle is relaxed it physiologically feels better, works harder, has greater endurance and recovers faster. The TriggerWheel has a ¼” oval treating surface for pinpoint accuracy. It is made of nylon and steel for lifetime durability.