the finish is several coats of polyurethane.
from top around edge --- macassar ebony, padauk, padauk again, African mahogany, Honduras mahogany then back to the African mahogany. The slanted pieces are red oak, purpleheart, hard maple, and padauk and on the upper left outside is hard maple
upper left and down --- hard maple, padauk, pine, purpleheart, red oak
center from left --- aromatic red cedar, purpleheart, redheart, aromatic red cedar again, pine, ash, red oak, purpleheart