Mr. Yu is a single-reed gas-sounding instrument of the Jingpo and De'ang peoples. In Jingpo language, "筚" is a general term for air-sounding musical instruments, and "general" means double, which means a pair of air-sounding musical instruments with parallel pipes. Folks have the same style but different specifications.

Rui Zuo, Ying is the small one. It is made of two bamboo pipes, the main and the auxiliary, which are tied side by side. The main pipe is 26 cm long, the inner diameter of the tail end is 0.8 cm, and there are bamboo joints on the top of the pipe. There is a rectangular blow hole 1 cm long and 0.9 cm wide on the side pipe wall 1 cm below the knot, and the blow hole is sealed. A copper reed is inlaid, the reed tongue is a 20° sharp triangle, a bamboo stick is placed on each side of the reed frame, and a gap of 1 cm long and 0.2 cm wide is left in the middle as a mouthpiece. The tube body has six (five in the front and one in the back) circular sound holes, and the back hole is the highest sound hole. The length of the pipe tail to the first hole is 4 cm, the first to the second hole is 4 cm, the second to the fifth hole is 2 cm each, the fifth to the back hole is 1 cm, and the distance between the first to fifth hole and the fifth to the blowing hole is equal. The thin bamboo tube on the side of the main tube is the auxiliary tube. The length of the auxiliary tube is 16.5 cm, and the inner diameter of the tube tail is 0.5 cm. There is also a rectangular blow hole near the upper end of the tube and a copper reed is sealed, but the tube body is not. Open the sound hole.