Small Animal Wheel Runner, FATPET&reg; Small Animal Exercise Toy for Small Pet Hamster and Mouse Small Wheel Runner provides interactive fun for you and your pet. Ideal for hamster, mouse and other small furry animals. Made with pet safe materials. Easy to clean and resistant to odors. Watch as Happy Hamster runs and runs inside his exercise wheel Measure: 11cm x 7cm / 4.3" x 2.7"