Rose used a 3-iron version of the club outside Washington, D.C., and told the company's tour reps it provided more control than a hybrid, along with a lower, more penetrating flight. He also said he would be putting the 1-iron version in at Hoylake.
Here's a look at the rest of the bag of the now six-time PGA Tour winner:
Ball: TaylorMade Tour Preferred X
Driver: TaylorMade SLDR 430 (Matrix Ozik 6m3), 10.5 degrees
3-wood: TaylorMade SLDR, 16.5 degreesIrons (3): TaylorMade Tour Preferred UDI; (4-PW): TaylorMade Tour Preferred MB 14
Wedges: TaylorMade Tour Preferred (52 degrees); TaylorMade Tour Preferred ATV Grind (58, 60 degrees)
Putter: TaylorMade White Smoke DA-62
Photos: Getty Images