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Jeromeo-
Contact mic would be my guess as well. Do you have a stereo/laptop with an aux in? You could try plugging it in and tapping it.
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I imagine if you plug it into your phone and open up the default voice recorder/memo app, it'd just be like recording using the mic in a standard set of wired phone earbuds. Not sure how sensitive they'd be as I've never used them myself, they normally are plugged into a field recorder or similar, so you might struggle to pick up the sound without an amp or something. But if you plug them in, record and give them a good tap you should be able to tell.
But with a standard 3.5mm connector and adhesive pads, I'd be amazed if they were something else.
Edit: Beaten to it
ltc
mmccarthy
Contact mic?