The che kind is clear and the mulberry variety is soft. The strings get finer as one proceeds from number one to number seven. There is also a set number of cords used to make up each string. Also strings one to four have an added wrapping. Chung-ch'ing is the most suitable.
Every cord is made of twelve threads.
If there are too many threads, then the cord will be too thick. If there are not enough, then it will be too thin. The first string should be made up of one hundred and eight cords. For the second string use ninety six cords. For the third string use eighty one cords.