Rev / Ball Motion TrainerThe Rev Ball Motion Trainer Eileen's Bowling Buddy invented the Rev Ball Motion Trainer you may see knock offs out there, but rest assured ours is better. We make our Rev Trainer with made in the USA steel rollers that are highly polished and won't damage your bowling ball like the cheap pitted rollers those knock offs are using. If you want the one that is worth your investment, you've come to the right place! The Rev Ball Motion Trainer allows you