The small muffled flute, commonly known as the leather whistle, is a double-reed gas-sounding instrument of the Yi nationality. In Yi language, it is called Yahalu or Benmaihei. In Yi language, "Benmaihei" means insect shell, and "Dili" means flute, which means the flute whose shell is used as a reed whistle.

When playing the small muffled flute, the pipe body is placed upright. The mouth contains the insect whistle on the top of the tube head, and it is played with a moderate breath.

Four-holes: Hold the flute with one hand and press the sound hole. Folk artists often use the left hand to press the hole. Professional song and dance troupe musicians often use the right hand to press the hole. The index finger, middle finger, and ring finger press the three holes on the front, and the thumb presses the back hole. The other palm is supplemented by actions such as stuffing, releasing, fanning, and closing to control and adjust the tone and volume changes.

Seven-hole flute: press the hole with both hands, the ring finger, middle finger, and index finger of the right hand press the three holes on the front, the ring finger, middle finger, and index finger of the left hand press the three holes on the front, and the thumb press the back hole. But you can't use the skills of boring, releasing, fanning, and closing.

The length or thickness of the pipe body, the size or hardness of the pipe whistle, the depth of the whistle in the mouth, the position of the lips and teeth and the changes in the strength of the air can all control or affect the sound of the muffler. In addition to the traditional folk acting technique of "gushing", it can also draw lessons from the performance skills of various other air-sounding instruments such as tongue, single spit, double spit, and finger vibrato. The four-hole small muffler has a range of d2-f3, using the method of controlling the breath, it can play music in the keys of A, bB and C. Seven-hole small muffled flute range c2-e3. The sound is melodious and idyllic, suitable for playing euphemistic lyrical, beautiful and beautiful tunes, and can be used for solo, ensemble or accompaniment.