Exotic Nutrition's Treadmill Wheel is the highest quality, all-metal exercise wheel for your pet. It is saucer-shaped with ball bearing smooth and quite design, making it completely silent. With a non-toxic powder coat safe finish and solid metal stand, the entire unit is 'chew proof'. Perfect for Chinchillas, Prairie Dogs, Rats, Hedgehogs, Degus, Sugar Gliders and other mammals. Add our 'Sandy Trimmer Strips'(sold separate) for automatic nail trimming while your pet exercises!