I recently purchased these casters for my wheelchair, and I am impressed with their quality. They are smooth and reliable making it easier to maneuver my chair. Based on my observations, they are durable and can withstand wear and tear. They are also affordable, which is a plus. However, the installation process was a bit difficult for me... Overall, I would recommend these casters to any Industrial and Scientific users looking for reliable and reasonably priced caster bearings..