OFFICIAL SIZE AND WEIGHT: These 12" practice softballs are official size and weight so you can practice exactly how you play FLAT SEAMS: The lay-flat seams on the balls minimize air-friction so you can throw for maximum distance DURABLE CONSTRUCTION: These softballs are made with a solid cork interior with a durable synthetic syntex cover so you can use them season after season OPTIC COLORING: The optic yellow cover makes these balls easy to track and locate in the daytime or under the lights PERFECT FOR BEGINNERS: These softballs are perfect for kids, youth softball players, and other beginners to learn how to track, throw and field the ball with ease! Official size and weight Cork/rubber core Synthetic cover Color: yellow