I would think that all you really need are the numbers for the cores, and those should be available on the manufacturer’s website. 13# is around the weight where some ball companies start using a generic core. I would think that even if it’s a generic core they would still list the RG and the Differential. The on-line ball vendors also include the core specs on their sites. As for seeing the actual shape of the cores, I don’t see how that would really help you determine if the ball would fit your game.
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