Double drum is a cylindrical percussion instrument made of bamboo or wood. The cylinder is thin in the middle and thick at both ends. The thin part in the middle is solid and has a round hole into which a stick can be inserted. When playing, you can hold a stick, or you can directly hold the solid part in the middle, and the other hand knocks on the hollow barrel with a stick to make a sound. The sound of the double-ring drum is crisp and firm, and there are two narrow mouths on both sides of the drum body. Because the length of the openings on both sides is different, the pitches played are also different.