This is a custom-made hamster cage I had made at a hamster specialty store a while ago. I no longer use it, so I'm selling it to anyone who has a hamster that would like it. On the first picture, the left side of the cage (when viewed from the front) has an open roof, which the owner can use freely. You could buy wood of this size at a home center or have it cut, and then place it on top to close it off as a removable roof. In my case, I prepared a transparent acrylic board of this size and placed it on top so I could see inside from above! I really enjoyed being able to see my hamster's sleeping face!