A 200 meter coil of Luxilon Alu Power ( 125 gauge ) tennis string.

Alu Power Details -

Alu Power string is by far the most used string on the Pro Tour. By providing an amazing combination of power, control, and spin potential, Alu Power is using by 73% of the top 100 ATP Pros. Luxilon manufactures Poly-Ether-Ether by modifying existing materials prior to extrusion. The production process is very slow. This is one reason for it's famous playing characteristics.

125 Gauge.