●Ideal playground for small animals. Relieves stress and lack of exercise for small animals ●Attractive and interesting, make your pet love sports, make exercise easier ●Design: The small wheels are translucent design, visually spacious and bright, so you can easily see your pet playing with it. Easy to install on wire cages or acrylic cages ●Application: Suitable for hamsters, guinnier pigs, chinchillas, and other small pets ●Diameter: 11/14/18cm