Klong that

Klong that (Thai: กลองทัด, pronounced [klɔːŋ tʰát]) are large barrel drums used in the classical music of Thailand. They are played with large wooden sticks. They are usually played in a pair and used in the piphat ensemble. Drums of this kind have also been called klong chatri (กลองชาตรี) and klong túk (กลองตุ๊ก).

The klong that and taphon as seen on a stamp.

A similar drum, called skor thom, is used in Cambodian classical music.