The ALU Power 125 tennis string is a high-performance polyester string made by Luxilon. Known for its use by many professional players, it offers an excellent blend of control, power, and durability. The key specs for this string are:
- Gauge: 1.25 mm (17 gauge)
- Length: 40 ft (12.2 meters) per set
- Material: Poly-ether-ether composition with aluminum additives for enhanced playability
- Weather resistance: Impervious to moisture and extreme conditions


