This is a 12.1cm x 9cm black mini envelope. I've added a subtle die-cut pattern to the flap as an accent. *Uses a Martha Stewart craft punch. The envelope itself was custom-made to your specified size and color. I'm not an expert on paper types, but it has a good thickness and feels sturdy. It's perfect for holding memos, business cards, or receipts in a shop. Stamping with silver or white ink would look stylish. Bills will fit when folded in half. *Price negotiations are not accepted. #MarthaStewart