Show Image
(http://geekhack.org/picture.php?albumid=86&pictureid=529)
(http://imgur.com/2ZwCo.jpg)
Looks like one of them BTC capacitive foam and foil boards.
Show Image
(http://geekhack.org/picture.php?albumid=86&pictureid=528)
Outside looks similar to this Futaba, although stem inside looks like the inverse.
(http://www7.ocn.ne.jp/~hisao/sejin_041.jpg)
Inside stem also looks similar to whatever Gateway Anykey has, some rubber dome.
(http://img.photobucket.com/albums/v331/laurie47/dsc00284-1.jpg)