Discount Pitching Machine Balls - Pitching Machine Pro30 results . Synthetic leather balls should not be used in pitching machines. . different types of balls; When using a seamed ball, feed the ball into the machine.kind of ball used in machine,How do they get the balls in ball bearings so perfectly round and .If you have ever rolled a couple of those little metal balls found in a ball bearing . Again, the same kind of machine is used, but this time the plates are made of a.
kind of ball used in machine