Here at ExclusiveBats we use motorized bat rollers to ensure that your bat is consistently spinning as we progressively apply pressure to the bat, that will guarantee your bat does not get any flat spots that you normally get when you use manual rollers. Here at ExclusiveBats we DO NOT believe in heat rolling composite bats as they are Fiber Reinforced Plastics and we all know whathappens to plastic in heat. Heat rolling aluminum bats is SCAM also known as upselling.