There are two types.
The beobgeum gayageum is 160cm long by 30cm wide by 10cm deep.
Its body is made of a single piece of paulownia wood.
The resonator chamber is hollowed out of the wood body.
It is used in court music.

The sanjo gayageum is about 142cm long by 23cm wide by 10cm deep.
The soundboard is made of paulownia, but the sides and back are of a harder wood such as chestnut or walnut.
It is used in folk music.
There are two types. The beobgeum gayageum is 160cm long by 30cm wide by 10cm deep. Its body is made of a single piece of paulownia wood. The resonator chamber is hollowed out of the wood body. It is used in court music.
The sanjo gayageum is about 142cm long by 23cm wide by 10cm deep. The soundboard is made of paulownia, but the sides and back are of a harder wood such as chestnut or walnut. It is used in folk music.
Gayageum