Titleist Brand Ambassador Greg Chalmers hits his new Prototype CB irons for the first time.

And here's a right-handed set of the new Prototype CB irons being worked on in the Titleist Tour Van.

A few of the new Prototype Titleist irons rest comfortably on the floor of the TTV, awaiting new grips.

The custom Cowboy Orange-paintfill and "R" stamping should give it away…

It's Titleist Brand Ambassador Rickie Fowler, of course.

Stay tuned to the Titleist Tour Blog for more pictures and updates from Aronimink!

The Titleist Tour Van is a bit more crowded than usual this week, thanks to all the boxes of new Prototype Titleist AP1, AP2, MB and CB irons (712 series).

Titleist Brand Ambassador Matt Jones's new Prototype MB irons were re-gripped and delivered to his locker at Arnonimink.

Titleist Brand Ambassador Kevin Na gives his new Prototype AP2 irons a closer look.

The new Prototype AP2 irons are already in the bag of Titleist Brand Ambassador Scott Stallings.