Re: What's this called?
I don't play Ping irons, so I don't know what your set is like, but a lot of irons the center section on the face is sand blasted fo give the ball a little more spin. Some others are machined in a way to leave the surface with shallow tool marks, again to add a bit of spin to the ball. Both will wear smooth over time, and there's not much you can do for the machine marks. If the face was sand blasted, that could be done again to return them to like new appearance. Any machince shop with a "bead blaster" can do this for you. Only for cast clubs, not forged by the way.
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