HGE2437: The Living World Chrome Plated Mouse Wheel is the ideal accessory for mice to receive proper exercise. Exercise is very important for small animals, as it helps to keep them strong and healthy. Your mouse will love running and receiving the proper exercise it needs! Features: -Mouse exercise wheel. -Living World collection. -Rust resistant. -Easy to clean. -Stimulates activity and exercise for your small animal. Specifications: -Diameter: 5. -Dimensions: 5.5 H x 5.3 W x 2.6 D.