1. Appearance: The black tube refers to the black main part of the sheng, and the yellow tube refers to the lighter-colored tube in the sheng compared with the clarinet. The appearance of the entire sheng is dominated by clarinet. Interspersed with lighter yellow tubes.

2. Sound range: The clarinet is a bass tube with a lower sound range and a calm and low sound. The yellow pipe is generally a high-pitched pipe with a higher range and a bright and sharp sound.

3. Purpose: The brass tube is used to play the main melody and treble parts, while the clarinet is used to play the bass and chord parts to provide harmony and balance of the music.