Manh or Bong Boc drum is a musical instrument belonging to membranophonic family, striking branch of Viet majority.

Its frame is made from wood of 6 cm height. It has only one surface of 10 cm in diameter, and is covered with leather. The other surface which without leather has diameter of 15 cm.

Mảnh drum is played with a stick which of 20cm length and is made of hard wood. Its sounds are dull, less sonorous. It is usually played in ensemble in small music orchestra.