I think it is made of very light tin - I want to say it's a very light gauge metal like flashing you can get at Lowe's. It comes on a roll. You have to be careful cutting it out because it can be very sharp.
If you are in a pinch I have seen people just use the spoons hot glued on a board without the metal.
That video was really great- thanks for sharing and I hope this helps.
You can use foil pie or cake tins cut up to make the formers. They are heavier than heavy duty foil on the roll. HTH
AI know this is an old thread, but does anyone have any photos or can describe better what they are talking about?