Youth leagues now have an affordable leather baseball designed specifically for pitching machines—Remember practice doesn't start until you break out the Pearls. JUGS Bucket of Youth League Pearl Baseballs -- 4 dozen leather pitching machine baseballs and a JUGS Pujols Bucket with LidJUGS youth league leather baseball designed specifically for pitching machines. Genuine leather cover, cushion-corked center, wool winding. Reinforced low seam design. Regulation size and weight: 9-inch/5-ounce— great for game or practice ball.