Thunder SY 11" USSSA Classic W Slow Pitch Yellow Softballs Set 12. 4U542Y. Thunder SY Classic W features a unique synthetic cover in optic yellow to poly core bonding process. This is a high quality 11" slow pitch softball that has COR .44/400 lbs. max comp. and classic W stamp. It also features the signature blue stitching. Approved by the USSSA, the Thunder SY Classic W is a grand slam when searching for value and quality. COR .44/400 lbs max comp. Classic W stamped. Synthetic Leather cover / poly center. Product Dimensions: 14 x 11 x 4 inches; Shipping Weight: 5 pounds. Quantity: Dozen Balls (12).