The Official League Baseball by Baseball Express is designed to provide reliable performance for training, gameplay, or everyday use. With their durable raised seams, these training baseballs give pitchers a better grip and control on the mound while enabling fielders to locate the ball quicker in their glove and make a more accurate throw. These adult baseballs are created with a full-grain leather cover to offer exceptional quality and durability, withstanding intense gameplay and being put through a pitching machine. The cushioned cork on the center of each hitting ball helps retain its shape, providing consistent performance by maintaining the ball's bounciness and responsiveness. Each corked baseball is also wound with grey wool to absorb impact upon contact and then return to its original shape, extending the life of each ball. These 12-pack bulk baseballs have a standard 9-inch circumference and 5-ounce weight, offering teams reliable, game-ready equipment for batting practice and baseball games. With its combination of raised seams, full grain leather cover, grey wool winding, and cushioned cork core, the Official League Baseball by Baseball Express provides consistent performance that will last you for years to come. Sold by the dozen.