These casters are built to last .Industrial and Scientific grade material makes them durable, strong, and perfect for heavy-duty use. Through trial and error I found that they perform best on smooth surfaces, making them great for maneuvering carts and equipment around the warehouse. The only downside is that they can be a bit noisy on rougher terrain, but thats a small price to pay for their reliability. Overall, a great investment FOR any company in need of reliable and sturdy casters..See full review