Patent ID: 7811020

Claim:
A writing instrument, comprising: a grasp body being a hollow main body, comprising: a first hollow tube body having a passing hole at one end, a plurality of scale holes arranged uniformly at a surface of the first hollow tube body, at least two semitone holes near the passing hole and a plurality of first air outlets located around the first hollow tube body; and a second hollow tube body having a protrusion end which tightly fits with a corresponding part of the first hollow tube body, an air inlet at the other end, and a second air outlet; and a refill disposed into the grasp body, and a nib of the refill being protruding outside of the grasp body from the passing hole, wherein the first hollow tube body is attachable and detachable from the corresponding protrusion end of the second hollow tube body, wherein air is injected from the air inlet, such that some of the air is ejected to the outside of the second hollow tube body from the second air outlet and the rest of the air is guided to pass from the second hollow tube body to the first hollow tube body and then ejects from the first air outlets to outside of the first hollow tube body such that different tones are generated by covering the scale holes and the semitone holes.