Visually stunning Curly Douglas Fir xiao, dyed a golden brown to accent grain. Key of C (tonic F) with sleeved Delrin mouthpiece for added strength and stability. This is a very rare wood and the last time I saw any was in 2007. I recently acquired a very few boards of this beautiful wood and will be using it for some select flutes while supplies last. When it's gone, it's gone!