Champion Sports Leather Baseball Set: Dozen Indoor/Outdoor Genuine Leather Official League Baseballs for Practice Training or Real Game - Pack of 12 SYNTHETIC LEATHER EQUIPMENT: Balls covered in Syntex leather for everyday usage and durability RUBBER AND CORK CORE: Combination rubber and cork complete core make these balls an economical choice for long lasting performance QUALITY SPORT ACCESSORIES: Classic raised red seams help to maintain grip and ball shape MULTI USE: Bulk baseball packs of 12 are great for both batting or pitching practice drills FOR ANY AGE: Youth to adult players will love hitting or pitching with these official balls