The 8" Prevue Hendryx Quiet Wheel is well suited for energetic pets such as rats, hedgehogs, guinea pigs and other small rodents. It can be used with a stand or it can be affixed directly to the cage depending on your needs. One of the biggest complaints from pet owners about exercise wheels is how noisy it can be, especially late at night since many rodents are nocturnal. But the Prevue Hendryx Quiet Wheel uses ball bearings to significantly reduce the squeaks and rattles during use. Attractive and modern design, the fully plastic wheel is easy to take apart and clean.