This is an ABS bass recorder with a design created to mimic the qualities of an expensive hand-crafted wooden model. It features very accurate intonation. In addition to the more common soprano and alto recorders, ensembles often call for other keys such as toner, bass, and even 'Great' bass recorders. Yamaha offers a full line of top quality tenor and bass recorders in both ABS resin and natural wood materials. In addition, Yamaha's Great Bass recorder plays with a surprisingly effecient balance between air and broad focused sound. Arched Windway:It has a slight resistance when you play for better breath control which gives greater tonal expressivity and projection.