The glong thap is a goblet-shaped drum

Goblet drum

The goblet drum is a hand drum with a goblet shape used mostly in the Middle East, North Africa, and Eastern Europe....

 used for providing the changes of rhythm and also for supporting rhythm of the Nora (Southern dance drama). Its length is about 40-50 cm. The body is made from heartwood of a jackfruit

Jackfruit

The jackfruit is a species of tree in the Artocarpus genus of the mulberry family . It is native to parts of Southern and Southeast Asia. It is the national fruit of Bangladesh, . The jackfruit tree is believed to be indigenous to the southwestern rain forests of India...

 tree that has been carved into a goblet shape. A single drumhead is covered by a thin leather made from langur skin or cat

Cat

The cat , also known as the domestic cat or housecat to distinguish it from other felids and felines, is a small, usually furry, domesticated, carnivorous mammal that is valued by humans for its companionship and for its ability to hunt vermin and household pests...

 skin, which is attached to the body by cloth strings of rattan

Rattan

Rattan is the name for the roughly 600 species of palms in the tribe Calameae, native to tropical regions of Africa, Asia and Australasia.- Structure :...

strings. The glong thap is almost always played in a pair, with one slightly lower in pitch called luk thoeng and one slightly higher in pitch called luk chap.