Here are some of the round Gold Foil Tonga stamps that I recently got from Phil. They are made of a very stout card stock and are thicker than I would have thought they would be. I noticed they have no appearent gum on the back and the whole back is cover with the phrase "Tonga The Friendly Islands". If any one has any idea of how they would be affixed to a cover I would appreciate the info.

These are hard to scan I tried my best to get them so that the color could be seen clearly.
Below is a retouched photo where you can see more of the colors on these stamps. Thanks MK for making them look better.