"I have purchased 4 of these wheels in the past for my Chinchilla, however, NOT because I was so happy with the product, but...with hopes that the NEXT ONE would last longer than the one I purchased prior! I COULD HAVE been MUCH happier, had the "plastic pieces" that attach the center of the wheel to the center of the stand NOT BROKE or CRACKED!! It IS TRUE that the wheel is VERY quiet, providing you have a sturdy and stable cage to set it in, or attach it to...but my Chinchilla is very active on his wheel and goes VERY FAST on it, causing the central plastic pieces to break and crack, only DAYS after I have purchased the wheel! I so wish "The Inventor" of this "Silent Spinner" could figure out some metal or steel pieces for the center of the wheel (to replace the plastic pieces) so it would not break and fall apart!! Having read other reviews on this product, I can also say my Chinchilla has been trapped a time, or two, under the wheel, when he has been running in it and then it breaks apart and falls to the floor of his cage. This is so frustrating when it happens because I love the wheel (as it IS quiet and goes SO fast) and so does my little guy, "Chin" - then, when it's broke, he doesn't have a wheel to run on and I truly think he's depressed!!! (Poor thing!) - I have tried many times to figure out a solution to this problem. I now have 4 wheels, but "wheels" ONLY! Nothing to attach the wheels with, to the stand or the cage, to make it work. Bummer!! (if your pet is a very small mouse and doesn't run too fast, this wheel might last)!"