Golf’s biggest equipment companies can agree on one thing: counterfeit clubs are bad for the consumer — and bad for business. That’s why Acushnet, Callaway-Odyssey, Srixon, Ping, PXG and TaylorMade came together in 2004 to form a group whose goal would be to identify and eliminate fake club operations across the world.

At this year’s PGA Show, we stopped by the booth of the aforementioned partnership (the U.S. Golf Manufacturers Anti-Counterfeiting Working Group) to find out a little more about how, exactly, you might know what you’re buying is a fake. Here are three telltale signs to watch out for.