Made of quality wood material, which is safe and comfortable for your pets. The new smooth running surface design greatly reduces the risk of injury. It's not only serve as playing, but also is chew and exercise for the small pets. The wooden wheel does noiseless,providing a funny place for pets to play and rest. This wooden walking wheel is suitable for guinea pigs, chinchillas, hamsters, gerbils, mice, squirrels and other small furry animals.