Jugs Small Balls Training Baseballs are sold by the dozen. 5-in./ 0.5 oz., Polyurethane-Foam ball. Designed specifically for JUGS Small-Ball Pitching Machine. Develop hand-eye coordination and a quick bat. Teach the hitter to track the ball from release point to impact zone. Increase the hitter's mental concentration by hitting a small ball. Help the hitter improve depth perception by keeping head still and eyes level. Teach the fundamentals of hitting while removing the fear factor.