Phin pia

The phin pia is a chest-resonated stick zither with two to five strings.

It is considered the national instrument of Northern Thailand.

[citation needed] The one string version (equivalent to the Cambodian Kse diev) is the phin namtao.

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Multi-stringed phin pia.
Phin phia, Thailand, 19th century. This is a multiple string phin phia.