The daegeum consists of a mouthpiece, cheonggong, and six jigong (finger holes.) A reed membrane is fixed over the cheonggong, and adds to the dynamic timbre of the daegeum sound. The daegeum was traditionally made of old yellow bamboo  which is most likely a type of Phyllostachys bamboo, but needs further research. The reed pith material is from a type of reed common to the marshes of Korea and is possibly from Phragmites japonicus, Phragmites australis or Miscanthus sacchariflorus. The cheonggong is gathered in the days before and after the fifth day of the fifth Korean lunar month (Dano). Dano is a traditional spring season religious festival in Korea.
 Healing Sound: 'Daegeum' maker seeks popularization of traditional instrument
The Korea Times
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Young Joo Park, Zong Woo Geem