The paiban is a clapper (a percussion instrument) made from several flat pieces of hardwood or bamboo, which is used in many different forms of Chinese music. There are many different types of paiban.

Typical materials used for the paiban include zitan (rosewood or red sandalwood) or bamboo, with the slats tied together loosely on one end with cord. It is held vertically by one hand and clapped together, producing a sharp clacking sound.

More Info: en.wikipedia.org