This is a hideout for lizards. Size (overall): W130mm x H106mm x D95mm (Inside): W100mm x H100mm x D60mm The material is MDF. It can withstand some water, but it's not very water-resistant, so it's not suitable for submersion. It's not suitable for use in humid tanks, as it may swell or grow mold. In our home, our corn snake only goes inside the hideout when it sleeps. It seems to be comfortable. Thank you for looking.