A great practice ball for high school physical education classes and youth leagues, the Champion Sports Official League Baseball is made with a rubber and cork core. It boasts a tough premium leather cover that can stand up to seasons of everyday use and polyester winding that helps it spring back into shape after even the hardest hits. Raised seams give the ball a classic look and feel in the pitcher's hand, and the tough leather baseball comes in packs of twelve for team drills and games.