Strings (tennis)
The material used in tennis string can significantly affect a player's performance, and even health. Several materials are used to make tennis strings. They vary in terms of elasticity, durability, rebound efficiency, tension holding capability, and manufacturing cost, among other considerations.
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.