Product Description ALU Power is the top string on tour for a reason - the aluminum present in the string enhances playability to go along with impressive power and control. Its unique poly-ether-ether composition exceeds all quality standards for near-zero string variance. Completely impervious to atmospheric conditions such as moisture, ALU Power delivers unrivaled consistent performance for championship-worthy results. Product Features Top string on the Pro Tour - used by roughly 60% of top 100 players Aluminum incorporated in the string provides superior power, control, and spin potential Two-color string compliments the Ultra v4 tennis racket collection Unique poly-ether composition exceeds quality standards and delivers near-zero string variance Technology infused in the strings protects it from extreme atmospheric weather conditions such as moisture and heat