"Kobyz" - musical instrument

Kobyz might be considered one of the widely-spread musical instruments of the Kazakh people. Kobyz is the bow instrument.
Kobyz is made of the whole wooden piece. It is one of the ancient way of producing the musical instruments in the human history. And it is explained not by the technical undevelopment or absence of metal devices.
Kobyz has no upper board and consists of a hollowed, covered with bubble hemisphere with the attached handle on the top and the bottom that stands for fixation. Two strings that are tied on kobyz are waved from the horsehair.
Kobyz is played, squeezed it in knees (as violoncello), with a short bow.
For kobyz kyuis onomatopoeia is characterized: imitation of wolf howling, swan cry, horse running, and sound of the arrow.