My bird eats safflower and millet. The hole in the bottom of each cup has been drilled to allow the chain to pass through. If you plan to use this for small seeds, you will have to use something to seal the holes or the small seed will just fall out the bottom of each of the 3 cups. I've just had it a few days and working on a fix to close those holes. I have heard others, placing a piece of cardboard in bottom of each cup. Just a FYI.
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[5 of 5 Stars!]