Wilson C300

You're probably wondering what those dark lines are on the crown. Flip the club over, and you'll see them on the sole, too. They're actually holes in the head that are filled with thermoplastic urethane. That compound isn't rigid, so the holes give the metal around them—including the high-strength steel face insert—the tendency to flex more at impact for more distance. Sole weights and an adjustable hosel let you achieve your preferred ball flight.