Material: Hamster Exercise Wheel is made of wood with a smooth surface and long service life, making it a great choice for your pet hamster Waterproof design: Hamster Wheel uses a new waterproof coating technology with Paint, which significantly reduces the risk of model after contact with water Cork running pad: Runner Wheel is equipped with a cork pad to increase friction and prevent your pet from slipping or getting injured while running Adjustable height: Small Animal Exercise Wheel 's height is adjustable to prevent accidental collapse Easy to install: Hamster Wooden Silent Wheel comes with detailed installation instructions for easy installation Specification: Material: Wooden Size Chart:wheel diameter 25cm/9.84inch, height 25cm-35cm/9.84inch-13.78inch, width 9cm/3.54inch Package Includes: 1 Hamster Wheel Note: Please allow slightly errors due to manual measurement and different monitors.Customer satisfaction is our primary concern. If the product is somehow cracked or broken during shipping, please feel free to contact us. We will try our best to give you a satisfactory solution.