Odd heatsink item

I found this while tearing apart some electronics. This was placed between 2 large heatsinks. Also had 2 wires coming out of these. Anybody know if these are just aluminum or something else?

Thanks in advance

http://i684.photobucket.com/albums/v...ps46b1259f.jpg

http://i684.photobucket.com/albums/v...psd2554d1b.jpg

http://i684.photobucket.com/albums/v...ps1e2bd784.jpg

Its a TEG MODULE

THERMOELECTRIC POWER GENERATOR

Thermoelectric generator - Wikipedia, the free encyclopedia

Eric

Thanks

Heard of these but first one I have found (or noticed)