Space saving Snap-on Comfort Wheel creates an external exercise area for small animals. Safe and quiet operation means very little disturbing noise. Easy to clean, removable Waste Collector Cup keeps the pet’s area clean and sanitized.Assorted ColorsDesign features a comfort grip that is safe for your pet’s pawsUniversally connectableSnap-on Wheel is 6.75″ diameter, 4.5″ wideFor hamsters, gerbils or mice