All materials are safe for animals and they are non-toxic. Made from to-class natural wood, this hut also makes a brilliant chew toy to ensure even wear of teeth. Wide entrance and hollow design, for keeping cool in summer or warm in winter, easy to use. Exquisite workmanship to make a cozy and comfortable nest for you small hamester. No odor and safe for long term use. Come with a paddle board for DIY a path for pet to enter the wooden house.Thicken board will not easy to break or decay.