Mainly that you buy from me in the US fakes come out of China. Size of the serial number is most important part. Tour heads are a very hush hush thing in the US and around the world. They are not really actually suppose to exist. I get them off a tour van from Ray Medlin a tour caddie who has caddied for Andy Bean, John Jacobs and such. He buys them cash straight from the guys on tour and sell to me.