Seat and back form pressed birch plywood.
Frame and armrests solid birch. 

natural lacquered birch
black stained birch
honey stained birch
white stained birch

 Oak, stackable up to 5 pcs

seat and back form pressed oak veneered

birch plywood, frame and armrests solid oak

Seat and back form pressed oak veneered birch plywood,
frame and armrests solid oak

Natural lacquered oak