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Large heat sink -high density fin aluminum? 8.5X7.25X4


Large Heat Sink -High Density Fin aluminum? 8.5x7.25x4
Heat Sink, High Density, Large,
They are made of non-ferrous (non-magnetic) metal. It appears to be nickel plating. The weight is substantial which makes me suspect they are not made of aluminum. The weight leads me to believe they are made of copper. I cant scratch off the nickel plating.
I have at least six of these heatsinks.