Wodent Wheels by Transoniq
Perfect and safe for rats and other small mammals.
It's the only wheel approved by the ASPCA. Many other wheels, especially wire wheels, can cause tail, neck, and foot injuries.
The senior size is a good size for girls and juveniles.
The wobust size is large enough for the largest male, but even our little dwarf ratty uses it.
Some ratties take some time to get accustomed to using the wheel, but they get the hang of it pretty quick once they realize how fun it is.
Wodent Wheels come in assorted colors, fully assembled.