Korpa 
This new model tenor incorporates Yamaha's wooden design expertise with the convenience and durability of an ABS material. It offers a focused, mellow sound which is balanced in all registers.
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.