These are all Little League Tournament approved baseballs (RS-T). A full-grain leather cover makes these baseballs naturally durable and helps them withstand repeated blows from the hardest 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. Stitched with raised seams for improved grip and greater control of the ball's flight path through the pitching motion. These baseballs come by the dozen; get 12 baseballs in one order.