Features: The Quiet Running Exercise Wheel, with its fun design, will keep your hamster entertained for hours and provide your small pet with lots of fun daily exercise such as playing, jogging and running, which promotes movement and thus keeps your pet happy and healthy. Durable Material: This hamster running wheel is made of plastic discs and steel bearings which are durable and safe to use. The stable tread provides reliable support while running or walking and is absolutely safe for your pet's tail and feet. Dimensions: disc diameter: 18cm, total height: 12cm, base height: 4cm. Super quiet hamster wheels: our hamster wheels have a super quiet design with smooth edges, you won't be disturbed by noise! Applicable objects: muffler of wheel suitable for gerbils, guinea pigs, squirrels, rats, hedgehogs, parakeets, parakeets and small animals.