The columns are all Lahu edge air-sounding instruments. Also known as the capital of the capital, the capital of the capital, and the capital of the ancient capital. The tube body is made of bamboo, mostly made of fine bamboo tube without knots.
The length of the tube is 30 cm, and the inner diameter of the upper end orifice is 1.5 cm. A rectangular gap 0.9 cm long and 0.7 cm wide is dug out on the front of the tube head for the mouthpiece, and there are also semi-circular mouthpieces without film holes. There are four squares below 13cm from the mouthpiece on the front of the tube body. Or circular press hole.
In addition, there are two-hole, three-hole and six-hole columns, but the four-hole is the most common.