(bamboo flute popular in Indian subcontinent.)
A bansuri is a side blown flute originating from the Indian subcontinent. The instrument is also common among other traditions such as Shaivism
A bansuri is traditionally produced from a special type of bamboo, that naturally grows to long lengths between its nodes (knots). These grow abundantly in Himalayan foothills up to about 11,000 feet with high rainfall. 
The harvested bamboo with a desired diameter is cut, dried and treated with natural oils and resins to strengthen it. Once ready, the artisans examine the smoothness and straightness and measure the dried hollow tube. They mark the exact positions for the holes, then use hot metal rod skewers of different diameters to burn in the holes. Drilling and other methods of hole making are avoided as it is believed they damage the fiber orientation and the splits affects the music quality. 
The wall thickness of the bansuri determines the tone, range and octave tuning. Once all the holes have reached their performance range, the bansuri is steeped in natural oils, cleaned, dried and decorated or bound with silk or nylon threads.
There are two varieties of bansuri: transverse and fipple. The fipple flute is usually played in folk music and is held at the lips like a tin whistle. Because the transverse variety enables superior control, variations and embellishments, it is preferred in Indian classical music.
References:
- Wikipedia, the free encyclopedia. Bansuri. (1 February 2021, at 05:58). Retrieved from https://en.wikipedia.org/wiki/Bansuri
