Oh goodness please no. No flying saucers of any size. Not for piggies. A Syrian hamster would love the largest size! At least mine used to until I discovered silent spinner 30cm wheels.
Great for hamsters and other rodents and chinchillas, but not for poor piggies! I can only imagine the terror a piggy would have trying to stop the thing once it got it started. And the curve done to the spine...
A lovely big cage or pen to eat and scamper about in. Or free range time. That's a piggy dream. Oh, and a loving, dedicated slave of course to listen to every squeak and wheek...