The Khim Thom is a larger form of the Khim Tuch. A square shape than its smaller cousin, it is also played using a bamboo beaters or mallets, but the sticks have cloth heads. It was also introduced at the time of “Lakaon Bassac”. The Khim Thom is only ever found in this type of music.

   The walls of the sound box are made of light wood and the sound board of fine-grained hard wood. The Khim Thom has main rows of frets, one on the left and the other on the right. Each row has seven beating points. The left row has three metal strings and the right row has two bounded copper strings. The frets are made of bone or ivory.

   The front part of the sound box is 110cm long, while the back part is 70cm in length and 4.5cm wide. The basic frame of the instrument is wood, with the only metal part being the string and the tuning pegs.

   The Khim Thom is tuned to the same pitch as the “Roneat Ek” instrument. The highest of the tone is ”E” but is lowered to a “D” in Mohowrri Chnai music.

   The Khim Thom was traditionally not much used in Mohowrri music as a rule. In more recent years, however, it can be found doubling the “Roneat Thoung” in the mohowrri music.