Feature:1. Exercise wheel for small pet such as hamster, gerbil and rat, maximum diameter 22.4cm.2. Adopt strong steel shaft and premium grade PP material; With thick wall and round edge.3. Silent structure, your animal can run at night without disturbing others.4. No gaping place, your pet won\u0027t get its feet hurt or wrenched.5. Non-slip convex lines enlarge friction and enhance stability to avoid false step.6. Exercise wheel for small pet such as hamster, gerbil and rat, maximum diameter 21cm.7. No gaping place, your pet won\u0027t get its feet hurt or wrenched.Silent structure, your animal can run at night without disturbing others.8. Wide suitability, can be mount on various pet cage. A funny help to keep your pet slim and healthy.Specification:Help your small pet to keep healthy! This exercise wheel is exactly the right thing you need. Run whenever it wants! This big and thick wheel is safe, quite and durable.Features:Exercise wheel for small pet such as hamster, gerbil and rat, maximum diameter 21cm.Adopt strong steel shaft and premium grade PP material; With thick wall and round edge.No gaping place, your pet won't get its feet hurt or wrenched.Non-slip convex lines enlarge friction and enhance stability to avoid false step.Silent structure, your animal can run at night without disturbing others.Wide suitability, can be mount on various pet cage. A funny help to keep your pet slim and healthy.Specifications:Color: Pink / Blue (Optional)Material: PPMaximum Diameter: 21cm / 8.3"Minimum Diameter: 19.6cm / 7.7"Height: 8cm / 3.1"Item Weight: 231g / 8.1ozPackage Size: 22 * 21.9 * 9.8cm / 8.7 * 8.6 * 3.9"Package Weight: 330gPackage List:1 * Wheel1 * ScrewNote:There might be footfall and slight wobble when your pet is running.Package List:1 * Wheel1 * ScrewNote:There might be footfall and slight wobble when your pet is running.