This was a COMPLETE failure.  My 10 pound Cavapoo puppy knocked the walls down over and over and over again--escaping.  They're fastened with tiny little zip ties that just don't hold the weight of even a little dog jumping on then.  Then you use these absolutely absurd discs to "keep the walls" in place.  It's one of those designs that you know was made by a person who has no pets or children--or brain.  Honestly--I'm depressed!  I bought several sets of these with the highest hopes!  Now I'm stuck with over $300 worth of JUNK that is surely going to go to the trash.  Sad....