It is well-made of natural wood material, no odor, safe for pet hamster use. Bite-resistance and wear-resistant design achieve reliable support when running or walking, durable to use. Not easy to break or deform, long-serving life. A fun exercise wheel toy for small pets, like hamsters, Chinchilla, Guinea Pig, hamster, etc. Features -Color:Beige -Material: Wood -Size: 29.00X9.50X32.00cm/11.40X3.73X12.58in -Large outer diameter: 29CM/11.4in, inner diameter 28CM/11.02in, Base width: 14CM/5.51in, running wheel width: 9.5CM/3.73in, inner width: 8.6CM/3.38in, overall height: 32CM/12.59in - Work out time would bring them more joy, and they would become healthier. - Entertainment, decompression and exercise for small pets, fun companion toy for your small pets when they are alone. - Give your lovely small pets a good opportunity to play and exercise, keep them from being too bored. - Quiet sports toy for small pet to run, will not make any noise to disturb your sleep at the night. - Funny mute hamster running wheel toy, your small pet will love it. Package list: 1 x Hamster Running Wheel