Strings (tennis)
In tennis, the strings are the part of a tennis racquet which make contact with the ball. The strings form a woven network inside the head (or "hoop") of the racquet. Strings have been made with a variety of materials and possess varying properties that have been measured, such as dynamic stiffness, tension retention, thickness (gauge), string texture (shape of the string), and rebound efficiency.
Guqin strings
In 2016, the Japanese string maker, Marusan Hashimoto, produced what they call hybrid strings for qin. They are made like traditional silk strings but with a Tetron twisted core and for the four thicker strings having a nylon wrapping. Their main selling point is that they can be tuned to standard pitch without breaking and are more stable. Other than that, they are very similar to silk strings, especially in the sound being the closest compared to the other synthetic strings.