[Material & Size]This hamster running wheel is made of high-quality plastic. [Help Your Pet Exercise]This hamster wheel can help your hamster exercise and reduce excess fat. All you need to do is put your hamster inside the wheel and the hamster can run free. [Silent Hamster Wheel]Silent bearing design, safe and no noise, does not affect the daily work and rest of others. [Adjustable Stand & Sturdy Base]The height of this hamster wheel is adjustable with a stand, and the sturdy base keeps the running wheel steady without falling over. size: Wheel diameter 17.5cm Material: plastic colour: A-Black Package Contents: 1 x Hamster Wheel 1 x stand base Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.