Thin wood: maple, ash, cherry, oak, walnut. The heavier wood connecting both sides is cherry.
"Currents" spreads more horizontal. It has 2 independently moving sides to it, making it very dynamic.

This thin wooden mobile is a delicate piece of art. It will naturally react to humidity by slightly bowing. The natural wood pieces have a protective coating on it.
This piece will give you joy, anywhere in your home or office; living room, bed room, office, staircase or entry. It should not be in a humid environment, open window (at least not on the east coast) nor hang close to a woodstove as you could with the copper pieces.
Dust can be removed with a brush. Cloth might get stuck in the fibers of the natural wood.