Cor is the center of the softball. With the different sizes .47 or .44 these are the size of the cor inside the ball. How it affects the ball is the cor is like the sweet spot. You know how a bat has a sweet spot....well a ball has the same thing. The size is important because the bigger (.47) the sweet spot the better chance you have of hitting it and it making solid contact. So a bigger sweet spot is easier to hit and will like make the ball travel rather and faster.
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