This cage is very well put together and sturdy. Most of the assembly was complete inside the box, allowing for a very simple completion of the cage. The reason I didn't give 5 stars was because this cage was advertised as a small animal cage, specifically indicating that it would work for small animals such as hamsters and gerbils. This was a very inaccurate description as the width between the bars is not suitable for such small animals and allows my pet squirrel to pass in and out out of the bars with no effort. While the cage is very good quality and the design is great for larger animals, I would not suggest purchasing if you have a smaller animal. To be honest, I'd be leary of even purchasing for a smaller ferret with such wide spacing between the bars.