The upper portion is made out of Spalted Maple. The wedge out of Hard Rock Maple and the bottom out of Beech (I think). Finished with 3 coats of GF's oil based Gel Topcoat satin and then one thorough coat of wood butter.
Here's a YouTube link where you can hear (sound on) the sweet sound and see it in action!
Thanks SplinterGroup! I kept the prototype one for if I choose to use my chisel. But my chisels are the sweethearts and I don't care for removing the handles.
BTW - If you shape the bottom of the wedge to an angle it should send the curls out of the side escapement and you won't need to keep clearing the mouth.