Caleb Henderson, left, and Reid Smith, both on the golf team at Boyd-Buchanan High School, listen to Jon Williams, owner of Golf Headquarters, explain various ways to differentiate between a counterfeit golf club and a real one at the Hamilton Place Boulevard store in Chattanooga on Monday. Williams estimates that his store sees between five and six hundred counterfeit clubs annually, and that over 65 percent of the online golf market is counterfeit.