That corner one is a temperary one, I have a regular shaped super pet one that I will place in there. I have no clue how big she is so I just stuck the smaller one in there for time being. I have guards on the side of the cage to catch some of the shavings. I want her to be on shavings for a while, since she has been in a metal cold box for a year Gives her something nicer to rest on. I will probably use something else the next time I clean her cage. I will not use newspaper though.