Do you have a beaver or a bird? A bark-on basswood slice with 2 layers of wood blocks and crinkle paper shreds. Basswood is a lightweight wood similar to balsa, with a bit more durability. It is soft enough to sink a beak into, but offers a bit more resistance for birds who quickly plow through the softer balsa wood. This toy mounts on the side of the cage using stainless steel hardware with wingnuts and washers. Basswood board is approximately 6″ wide by 8″ tall and 1″ thick. Finished toy is approximately 3″ thick with toy pieces attached. Click here for a refill!