Gangdong, also known as Ganglin and Zhaling in Tibetan, and Dharma and Lama in Han, evolved from ancient horn-like musical instruments and is one of the instruments of Tibetan Buddhism.

The tube body of the Gangdong is mostly made of copper, but also made of silver or bone. Different shapes, different specifications. The copper or silver steel hole is a veritable leg-shaped horn, similar in shape to a big bull horn, and consists of three sections.

Gangdong in a Tibetan Buddhist monastery in Lhasa, Tibet, the tube body is 45 cm long, the upper section is 15.5 cm long, the upper end is a mouthpiece, the diameter is 2.5 cm, the middle section is 11.5 cm long, and the lower section is 18 cm long. The body is thin on the top and thick on the bottom, slightly curved, the lower bell mouth is oval, the long diameter is 8.5 cm and the short diameter is 5.8 cm. The head of the god, also inlaid with agate or pine otolith;

The bone-made hole is a veritable leg bone flute. According to ethnomusicologist Tian Liantao's "Tibetan Traditional Musical Instruments": "It is said that it is mostly made of the tibia of a virgin (or a young mother who died of childbirth), and its size varies, generally about 30 cm long, and one end of the mouth is bone. On the cross-section, one end of the horn is the thicker joint, with two air holes, and there is no sound hole on the horn, and a copper (or silver) ring is inlaid with exquisite patterns."