I agree with every one of the one star reviewers! Guinea Pigs have very fragile spines that cannot flex in that way! This can damage your piggies feet, spine, and even break his spine! Plus they crash into things and Guinea Pigs can get VERY easily overheated and die! I cannot believe they would sell this product!
Guinea Pigs are not like hamsters, just put your piggie down in a safe room free of wires and places he can get stuck. He will wander around and love it! He won't run away like a hamster. This toy teases the. If you must do something with them while you clean their cage put them in a large no-top container. This is not good for their poor little legs! How would you like living in a cage, and then you finally get to explore, but you're in this this that's unstable, has a rounded surface and confuses you.
It's kind of like shape ups. Great shoes but imagine walk on those that are five feet tall. No control! That's how those poor piggies feel! They get scared and overwhelmed easily!
If you love your piggie, don't buy this!!!