Powder coated finish wont chip or fade zinc die cast tops bases and ports to last a lifetime. Stainless steel wire squirrels cant chew snug fitting sliding cap easy for you to lift but hard for squirrels. Top assembly easily removed for cleaning. Threaded base attach a 6t or omit seed tray to catch seed and provide extra room for birds. Stainless steel mesh is correct size for shelled peanuts peanut mixes or black oil sunflower seed. Attracts woodpeckers. Aluminum perches cant be chewed don't hurt birds feet.