[mman1506]

Originally Posted by NickTosta

I see two pneumatic cylinders directly behind the ball. Granted, it's hard to say exactly what they're for, but they appear to be positioned correctly to "punch" the ball.

edit: To be honest, it looks like those small cylinders punch the ball into the black rollers. So, it's probably both.

We talked to them, it's a combination of wheeled and pneumatic but a the majority of the work is done by the wheels.