The Luxilon ALU Power 125 Tennis String is one of the most-used strings on the Pro Tour. By providing an amazing combination of power, control, and spin potential, the ALU Power is used 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 its famous playing characteristics.