I recently purchased the Caster Locking Polyurethane Casters for my warehouse and I couldn't be happier! These casters are perfect for moving heavy loads around my industrial space. As a result of my tests, I determined that they have a smooth roll and great braking power when locked. I also love that the polyurethane material prevents any scratching on my floors. However, the only downside is that they are a bit pricier than some other options on the market. Overall, I highly recommend these casters for any industrial and scientific material handling needs!