I'm pretty sure most of the overseas balls are made a tad different because they don't use as much oil overseas.. So everything, high-performance wise, made here would typically be way too strong for over there. The point is, they just make certain balls either factory finished weaker (shinier), or they just make the ball a little weaker.
From what i've seen and read, that seems to be it. Otherwise, I have no clue. Some of the balls made overseas look like awesome US releases. I don't know exactly what the point is.
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Brian
http://BeansProShop.com
Home of the Secret Sauce!