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X-Comps generally have a cosmetic blemish that in no way effects the reaction of the ball making it nearly as good as a 1st quality bowling ball. The Pin to CG Distance will be 2-4†and the Top Weight will be within 2-4 ounces. An X-Comp will have a C stamped by the serial number. The label on the box is stamped X-Comp and is marked with a small red number that denotes the specific issue.