Gut string is a type of string made from the intestines of animals, primarily sheep or cattle. It has been traditionally used in stringed instruments like violins and cellos, as well as in sports equipment such as tennis rackets. Gut strings are known for their warm, rich tone and responsiveness, making them a popular choice among musicians. Despite their advantages, gut strings are sensitive to humidity and temperature changes, which can affect their tuning stability. Today, synthetic alternatives are also available, offering more durability and consistency while attempting to replicate the sound quality of natural gut strings.