The Kaytee Comfort Wheel features a safe, solid running surface, quiet operation and a "tail-safe" design, allowing small pets easy entrance and exit. Every Comfort Wheel comes with a heavy duty wire stand and a 2-way attachment clip, so the wheel can be used either free-standing or clipped to a wire cage. Available in sizes small, large or giant. Perfect for hamsters, mice, gerbils, rabbits, chinchillas and ferrets.