Champion Sports Hollow Plastic BaseballsATHLETIC BASEBALL EQUIPMENT: Spend time outdoors with Champion Sports Plastic Baseballs; perfect for practicing your pitch, batting skills, or for some leisure time playing catch with friends REGULATION SIZE BALLS: Each plastic hollow ball has a 9. 00 inch circumference so you can use them for pitching, batting, throwing, and catching practice to improve your baseball game every time FUN FOR ALL AGES: Little kids and adults alike will love these