This is a hide for a gecko. Size (overall): W130mm x H106mm x D95mm (Inside): W100mm x H100mm x D60mm The material is MDF. It's okay if it gets a little wet, but it's not a very water-resistant material, so it's not suitable for submersion in water. It's not suitable for use in a humid tank, as it may swell or grow mold. In my house, my corn snake only goes inside the hide when it sleeps. It seems to be comfortable. Thank you for looking.