Made of plastic. They were very difficult to put together and I got a lot of compliments on it. I used this product for a baby shower I arranged for my son. On these trays I put small desserts in chocolate. Aside from that, these trays aren't very strong and can't support much weight when knocked over. The supplied screws are round. They don't lie flat and cause the shelf plates to wobble. I went to ACE Hardware and bought 3 pan head screws for 32 cents each and it helped control the wobble. The photo shows the difference in the screws. They are the same width and length, just a flat head instead of round.
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