Considering their size, my rats have more space in this four-level cage than I have in my apartment. I can leave them in their cage most of the day knowing they have plenty to do. There are more than enough attaching points to hang toys, hammocks, ropes, etc, for their amusement. The horizontal bars make the entire cage a piece of exercise equipment for them, as they climb all over it. The locking doors are secure enough to keep my smaller grandchildren from opening them alone, yet, I can easily open with one hand. The double doors swing completely open for easy access. Every interior item comes out easily for cleaning. This is a great product and a wonderful home for pets.