What is the classification of pipa strings?

Pipa strings are an important part of the pipa and have a crucial effect on the tone and performance of the pipa. There are four strings on the pipa, from thin to thick: the sub-string, the middle string, the old string, and the winding string.
Pipa strings are made of various materials, including nylon strings, steel strings and silk strings. Nylon strings have a soft tone and are suitable for beginners; wire strings have a bright tone and are suitable for music that requires a high pitch; and silk strings have a simple tone and are often used in traditional music.

In addition, the maintenance of pipa strings is also very important. Prolonged use or improper storage may lead to aging, deformation or breakage of the strings, so it is necessary to replace the strings with new ones regularly and keep them clean and dry.