The Gamma TNT2 1.32mm tennis string set is 12.2m (40ft) long & features an Elastalon centre core, as well as outer wraps with a Pearl Coating for ultimate durability. It has a gauge of 16 (1.32mm) & provides exceptional power, feel & control. The string set is part of the All-Around series & incorporates the TNT2 technology that improves dynamic elasticity (storing energy) & dynamic resiliency (returning energy to the ball) for maximum control & accuracy, as well as for increased speed & power.