Five (maybe more) pieces of aluminum sheet metal. They are rolled, and were meant to be part of a Solar tube skylight installation. But you can flatten them out to get an approximately 24" by 27" sheet. One side is shiny, covered with a yellow protective film. You can repurpose them to reflect light in a garden or greenhouse setup.
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Shiny Aluminum Sheet Metal (El Cerrito)
This offer has been gifted to someone and is no longer available.