This is an easy way for my 2 cats to safely enjoy my 3rd floor patio. The styrofoam packing material was completely broken into tiny little balls when it arrived. I've spent hours trying to get them off the bars, my carpet and cats. The good news is it was in perfect shape and not damaged. The wheels are very small and the brake lever on them is almost their same size so it catches in my carpet when I bring it indoors. I haven't been able to find replacement wheels that fit. My kitties love it love and enjoy being able to get outside for fresh air on nice days!