These CHAMPRO 300 Series official league baseballs are designed for use in college practices and high school games. With a full-grain leather cover, they're naturally durable and withstand repeated blows from hard hitters. They contain a cork pill double-cushioned rubber core wound with 15% wool yarn to maintain the ball's shape, size, and weight under intense use. These balls are stitched with raised seams for improved grip and greater control of the ball's flight path through the pitching motion. Equipped with moisture barrier technology to reduce moisture absorption, maintaining the ball's desired weight. These baseballs come by the dozen; get 12 baseballs in one order.