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.
New standard tuning
NST places the guitar strings under greater tension than standard tuning. Standard sets of guitar strings do not work well with the tuning as the lowest strings are too loose and the highest string may snap under the increased tension. Special sets of NST strings have been available for decades, and some guitarists have assembled NST sets from individual strings.