Braz
it is a hollow box, the top plate (walnut) is glued on three sides to the body. The unglued side has a liip that extends beyond the side and is thinned like the soundboard on a box call. Underneath the lip the side has an open slot (thus the unglued side) which allows the vibrations to excape .........
When rubbed with the flat bar the soundboard vibrates
The bottom (cedar) is thin stock and glued on alll four sides. The cedar soundboard is sanded to a slick finish and does not have any coating on it.
When the pot striker is used, it works like a pot call, but allows for long strikes not short ones on a pot.
Bill