1 Pieces 2mmx100mmx100mm 99.9% Pure Copper Sheet Metal Plate About 4"x4"x0.08"

It is very hard. I was planning to cut strips from it with tin snips. My mistake for ordering the 2 mm thickness. Tin snips will not work. I will keep it but order from the same place thinner plate.

I use this as a grounding plate for a mobile antenna, along with a grounding strap, and it works well

It's a good product. Its edges are not particularly flat, probably because of the cutting process.

My piece had major gashes on both sides. I wanted to use it as a thermal mass but without a smooth surface it will have worse heat transfer.