These cards include a metal pin attached to a card made from recycled paper. The pin can be worn or be used to decorate other items. Each card weighs less than one ounce, is blank inside, and includes an envelope for mailing. (It is not machinable.) The metals are nickel, copper, and brass (lead-free). The paper is handmade from mulberry trees. Each pin and card is individually handmade and will vary slightly based on the artist.