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.
TransTrem
The TransTrem (or TT for short) requires custom double ball end strings to work properly. Each string is calibrated to a specific length: as little as 1/16" deviation from this specification adversely affects string tuning. As of 2009 D'Addario, La Bella, GHS and the Steinberger brand strings are the only ones offering calibrated double ball sets.