Jugs Pearl Leather Pitching Machine Baseballs are sold by the dozen. Full Grain Leather Cover, Cushion-Corked Center, Wool Winding. Lasts 5 Times longer than any other brand of Baseball (when used with machines). Regulation Size and weight: 9 in./5 oz. Great for game or practice ball. 1-Year Guarantee on NeverBreak™ Seam.