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I bought these, and they are kinda cute! Plastic. The chain isn't the sturdiest, of course, but adequate. I might make them into earrings. It took awhile to arrive from Hong Kong, but that was satisfactory, too.
P.S. In case you click on the link, and this particular auction has expired, on e-bay.com type in "Freddie Mercury cell phone charms" because the sale of this product looks ongoing.