I have a white oak burl howler for sale today. The call is voiced with a Carver toneboard. It is 5" long and just under 1 3/4" across the bell. The call is finished inside and out. Price $25 shipped.
(http://i261.photobucket.com/albums/ii57/armyturner/calls038.jpg)
(http://i261.photobucket.com/albums/ii57/armyturner/calls039.jpg)