The Silent Spinner Wheel is a Patented, Ball-Bearing Super Silent Wheel For Mice, Dwarf Hamsters, and Gerbils. The Silent Spinners Work Two Ways: Free Standing Or Attached Directly to Any Wire Cage. It is made with High Quality Plastic. The Running Surface Is Safe and Comfortable For Your Furry Friend's Feet. Size: 4.5'' Diameter. Available Colors: Blue, Purple, Red, and Green. Sorry, no color choice.
