100% non-toxic! Manzanita core with brightly colored sand permanently bonded to it. The natural tree limb shapes are great for your birds" feet - something concrete can not be! Benefits include: safe wet or dry, leaves feet soft, extremely durable, trims better and has natural wood insulation. Won"t crack, chip, or shatter if dropped so you don"t have to worry about your pet"s environment. They"re tough enough to survive our world but work great as a natural addition to theirs! Small is suitable for birds like Cockatiels & Senegals.