1 Pcs 6 hole f tone stainless steel silver flute 46cm hy90 description: name: f tone stainless steel flute model: hy90 size: about 46 x 2cm(l x d) thickness: about 1mm material: stainless steel colour: silver tone: f tone usage: for all beginner pronunciation principle: 1 edges effect the blow hole caused by a specific angle side edges, cutting through the air flow when the flute edges,leaving a portion of the airflow flute, a part of the airflow into the flute, resulting in a certain frequency of vibration and sound. 2 resonance effect when the flute, flute airflow into the spin spiral way forward, until you leave the flute so far in this process in accordance with the air column tube lumen diameter and length, resulting in different resonance frequencies, resulting in pitch.