The flute is sealed with non-toxic oils which give it a warm, resonant and full voice. The Condor Bass "D" is a good accompaniment flute for the Kestrel Flute key of "D". The flute is tuned in the key of "D" minor. It is 25.5" long. This is a 6-hole flute, High Spirits covers the 3rd hole from the top of the flute (known as the 6th hole) with a leather tie, giving the option to use it as a 6-hole or a 5-hole flute.