Batting practice begins with the Pearls. The hi-tech thread material is 5-times stronger than stitching used in other leather baseballs. Regulation size, 9 in. / 5 oz. Full-grain leather cover, cushion-corked center, wool winding. Makes for a great game ball or practice ball. 1 dozen balls. 1-year guarantee on Jugs® NeverBreak™ Seams.