Made with natural undyed felted sheeps wool, these cozys are perfect for hamsters, gerbils, sugar gliders and rats. Any small animal that likes warm dark places, they are hand washable lay flat to dry. There are 2 cozys, bedding should be replaced every other month or if chewing occurs. Caution should used when using all pet beddings, should not be ingested by your pet. I have used these for many years without any problems what so ever, and they have provided hours of fun for the kids and the rodents.