The natural scale for this flute is minor pentatonic (5 notes). It is also possible to play other sounds by widening the scale using the sixth hole, which by default is covered by the ring finger (third hole from the top).
This flute is very easy to play and is suitable for both musically experienced and beginners as well as children. The exception are the bass-size flutes, which require a wider finger positioning, which requires practice, similar to reaching for chords on the guitar.
The NASF flute is usually made of wood and its color may vary depending on the type of material. Hard wood usually guarantees a clear, stronger sound, while soft wood (e.g. red Canadian cedar or bamboo) will sound warmer and softer.