Habitrail OVO Exercise Wheel This OVO wheel is suitable for Habitrail OVO pad model 62600 and OVO suite model 62610 Also suitable for OVO studio model 62615 and OVO loft model 62620 Measures 2-inch length by 4-inch width by 6-inch height Provides your pet with the exercise and activity needed to promote a healthy life Does not include Pin Retainer