Prevue Pet Products SPV90013 Wire Mesh Hamster/Gerbil Wheel Toy for Small Animals, 8-Inch, Colors Vary Wire mesh hamster/gerbil wheel toy design prevents feet and tails from getting caught while pets are running Great for providing exercise inside or outside of the cage The wheel can also be securely hung on mesh cage sides Available in 4 assorted colors Measures 8-inch wheel diameter