Geoff's irons are custom-stamped simply with "G."

Titleist Brand Ambassador Bill Haas takes his first swings with the new Prototype CB irons.

Titleist Brand Ambassador Ben Curtis arrives at the Aronimink range with his new Prototype AP1 irons.

Titleist Brand Ambassador Johnson Wagner poses for a picture with his new Prototype CB irons.

Titleist Brand Ambassador Michael Sim checks in with the team at the Titleist Tour Van.

Brand-new, bubble-wrapped Prototype CB irons ready for assembly Inside the Titleist Tour Van.

The Titleist Golf Club R&D team gathers information during new Prototyope AP2 testing with Titleist Brand Ambassador Jason Dufner.

A set of new Prototype CB irons awaits its owner in the TTV.

Here's the view from the top.

Many players are having their previous iron sets shipped home.