?Fit for?: This running wheel Ideal for chinchillas, pet rats or other small animals. ?Keep Your Cute Pets Active?:The hamster exercise wheel are colorful to easy attract your pets attention, to provide a safe and fun place to exercise and play for your little pets, Anti-slip ridges increase friction, enhance stability, to avoid sprains, it suitable for daily activites of small animals. ?Easy to Install?: The diameter is 21cm/8.3 in, Thickness: 7cm/2.75in, Easily attachable to the side of the cage or alternatively placed inside using the stand. ?Quiet Spinning?: This mice Silent Spinners specially designed for quiet spinning, encourage your pet with hours of healthy exercise. ?Permium Quality?: This hamster running wheel made of eco-friendly plastic and iron materail, which is non-toxic, wear and bite resistant.