A hollow percussion instrument, usually made from bamboo or wood, that has parallel slits in one side and one slit across the middle, not always at the center point, to form the shape of the letter H. Unequal length tongues on the slit drum produce two different pitches. The ends of the slit drum are closed so that the shell becomes the resonating chamber for the sound vibrations created when hitting the tongues with a mallet. The resonating chamber increases the volume of the sound produced by the tongue and presents the sound through an open port.