Hello. I have not bought this product, and I do not plan to. Many hamsters have been injured in hamster balls. Plus, hamsters cannot safely stop in hamster balls and are almost always disoriented in them. They also don't have good ventilation at all. If you want to have playtime with your hamster, use a dry bathtub or buy a safe playpen for supervised play. They would like that a lot more. This information can also be applied to any small animal with hamster balls. Don't use them please.