I have heard of Pro-Ams having balls made for them, but even then they are standard mostly (mostly) with the color changed, most often. 9 times out of 10, they give away standard, commonly available balls; sometimes, dscontinued or badly selling ones which they get cheaper.
Why not ask the organizers of your particular pro-am which Inferno they are giving away? "From the horse's mouth", so to speak.
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"When we choose an action,
we also choose the consequences of that action.
