Google translated from http://neyneva.com/kiz-ney/
"The lengths of neys can vary according to the reed thickness and the wide or narrow opening of the inner hilt. What is made of a diameter straw will be shorter because of its large internal volume. Likewise, if the straw is thin, what will be longer will be slightly longer than it. Likewise, if the internal burn is opened narrow, the length of which is short and the internal burn is made wider, the height will increase.
NOTE: The girl is one of the ney counts of medium length. People who are just going to start are generally advised to take this from what. Our advice for beginners is ney because of the fact that the lessons are done in this ney course and they are medium size.
Decision Sound Si - B
The decision sound is based on the La sound in the normal blowing position, that is, the sound from which a curtain is open from below."