Guzheng

Looks like modified gusli or hammered dulcimer without hammers.

Some information from Wikipedia:

The guzheng, is a Chinese plucked zither. The guzheng is a similar instrument to many Asian instruments such as the Japanese koto, the Mongolian yatga, the Korean gayageum, and the Vietnamese đàn tranh.

The guzheng should not to be confused with the guqin (another ancient Chinese zither but a fewer number of strings and without bridges).

The origin of the guzheng can be traced back to two other Chinese plucked zithers, the se. The guzheng has existed since the Warring States Period and became especially popular during the Qin dynasty. The number of strings on the guzheng has always fluctuated, as we have as few as 6 to as many as 23 strings during the Tang dynasty. The earliest record of the guzheng or gu-jirn in Shi Ji is attributed to the historian Sima Qian in 91 BC.

Until 1961, the common guzheng had 16 strings, although by the mid-20th century 18-string guzhengs were also in use. In 1961 Xu Zhengao together with Wang Xunzhi introduced the first 21-string guzheng after two years of research and development. In 1961, they also invented the "S-shaped" left string rest, which was quickly adopted by all guzheng makers and is still used today, whether in the shape of the letter "S", "C", etc. This curve allows for greater ease in tuning the strings and, combined with strings of varied thickness, allows for greater resonance in both the deeper and higher pitch ranges. The 21-string zheng is the most commonly used, but some traditional musicians still use the 16-string, especially along the southeastern coastal provinces of China and in Taiwan.

The guzheng is tuned to a pentatonic scale, the 16-string zheng is tuned to give three complete octaves, while the 21-string zheng has four complete octaves.

How it looks:


Example of playing: