What is the weird instrument Eric Clapton & Comp. played in the Unplugged version of San Francisco Bay Blues?

In the end of the song EC jokingly remarked that he'll "Never (do it) again..."

Is that the song where they all start playing Kazzoos?

http://images.nittanyweb.com/scs/images/...

Don't know if my spelling is correct, but I think it was a Dobro.

I'm just guessing but I'll also go with a dobro, probably a "National" dobro.

kazoo