Electroplated leaves - ivy maybe? Actually copper plated over a real leaf, so each one is a little different. Plating is .25 - .5 mm on each side, overall thickness is just under a millimetre.
Surprisingly durable - they are metal, after all! If you bend them, you might hear the leaf cracking inside, but don't worry, it's not about to fall apart, the leaf inside is dried out, but not part of the structural strength.
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