Thunder Heat Series. ASA Fast Pitch. Top grade Yellow leather cover with Red stitch. Unique gluing process that bonds cover to poly core. COR: .47 Compression: 375 lbs. Size: 11". Sold in dozens. Maximum liveliness at legal association specifications. "THE BALL" for fast pitch. Size: 11" Thunder Heat Series Top grade Yellow leather cover with Red stitch. Top grade Yellow leather cover with Red stitch Unique gluing process that bonds cover to poly core.