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For sale is a lot of 42 lbs of Copper Tin Coated EDM Tubes. I believe that they are all made of copper, or bronze (they have a VERY red coppery tint where they are cut), and coated with either tin or silver. I tried cutting a sliver off of one tube with a box knife, and it feels like a pure copper when cut. It came from a cabinet with EDM supplies.
