It's a tiny bit larger than a quarter, and feels decently heavy in the hand. I can't be sure it's metal, but it's an incredible simulation if it's not. It looks like a dull brass, and shines under bright light. The etching is well detailed and doesn't degrade when you test it with a fingernail.
A good product for the price, I think. I wish it were a skosh smaller, but that's a minor quibble, really.
UPDATE: Checked it with a magnet; sadly it's either not metal or it's not ferromagnetic.