String diameter

Strings with smaller diameters gain better ball acceleration. They are especially suited for rackets with higher string closeness and small head size. Energetic 1.2, Pulse 1.2 and Professional. 

A larger string diameter (1.30 mm / 16) offers the player higher string durability. Such strings are preferrably used in rackets with lower string closeness and large head size. Pyramid, Control, Energetic Plus, Energetic 1.3, Pulse 1.3 and Tournament Plus 1.3.