The Sing Mong is a drum with size and shape similar to the Glong Yaao of the Central Region, assumed to be influenced from the Central Region or from the Burmese Glong Yaao. It is a single-face drum which is stretched with cords or leather strips. The middle part of the drum face is not applied with lacquer. The body is made of hard wood such as wood of the mango tree or other kinds of wood found in the locality. The sizes of the body vary according to the desire of the users. Generally, the face of the drum is about 20-25 centimeters in diameter. From the face to the end of the tail is about 75-80 centimeters long. The face of the drum is larger than the rear part, which is tapering and flared out resembling a flower called Dok Lampong (Loudspeaker). At the edges of the drum there are hoops for tying a rope to sling across the shoulder. The drum is beaten by hand. Its body is not decorated with pleated cloth resembling a skirt as the decoration of the Long Drum of the Central Region.
         The name of the drum comes from the sound of the Kong Mong and the drum when the two instruments are played together. The drum has several names according to the sound the people hear. Before beaten, the Jaa is fixed onto the central part of the face of the drum to weight the leather so that the drum can produce resonant sound. The amount of the Jaa can be added or reduced as desired. This method is the same as done in other kinds of drums.
         Generally, a drum, a pair of Chaap and a Kong Mong can be played in an ensemble. A number of the Chaap and the Kong Mong may be added to produce louder sound. The local people widely call it the Glong Ting Bom (กลองทิ่งบ้อม) ensemble. When played, the Kong Mong is beaten to keep the constant rhythm, while the drum and the Chaap are teasingly beaten in syncopation with the Kong Mong. This kind of ensemble is widely played in accompaniment with the Fon Jerng and the sword dance (Fon Daap) as well as in general processions.