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Are the bottom frames for multiple coins and the top for the singles?
Maybe "metal token" ... ?
What about just wrapping them in a piece of cardboard in a padded envelope?
When I ship any of my coins I just sandwich the coin between 2 pieces of cardboard and tape it up and put it in a padded envelope as well. And I always put "metal token" in the description. Never had any problems and i've shipped dozens. Oh and the plastic padded envelopes are much better than the paper ones. The paper ones tear a little too easily with rough handling were as the plastic ones just stretch, lol.
(Just in case you wanted an in depth analysis on envelopes, hehe.)