Offically the Catania Bass Bamboo Tong Drum. It's made from a large half-cylinder of bamboo with a padauk top/keys. It was purchased from Elderly Instruments.
Note that the given pitches are approximate, due to the interaction between the tongues, the notes are more like chords with one tone slightly predominating.
These files are original recordings and photos from the Sudden Sound Studio instrument collection.
All files are copyright © 2002 Greg Bossert, and released under the Open Audio License (O) Greg Bossert www.suddensound.com 2002 V.1.0. This means you can pretty much do what you want with these sounds as long as the attribution and license stay attached. See the license at the EFF for more details.
web: http://wwww.suddensound.com/
email: bossert@suddensound.com