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.
Jascha Heifetz
Heifetz was very particular about his choice of strings. He used a silver wound Tricolore gut G string, plain gut unvarnished D and A strings, and a Goldbrokat steel E string medium including clear Hill brand rosin sparingly. Heifetz believed that playing on gut strings was important in rendering an individual sound.