These stairs did not work for me. I have a 60 lb bulldog and these stairs were not stable enough for her. They are rather steep and are made of plastic. There are tread runners on each step which was nice and there are grips on the bottom so use on a hard surface floor would be safe. The plastic on this is thicker than most but not super thick. It would handle a 25 lb animal without issue but not much more than that. While this didn't work for me it would be a nice addition to someone with an older smaller dog.