Wilson's Duo Power combines NXT Power (16/1.30) with ALU Power (17/1.25) to deliver unparalleled power on the court. The soft and explosive characteristics of NXT perfectly complement the exceptional blend of power, spin, and durability offered by ALU Power. The ALU Power strings in this set feature a slightly thicker diameter, ensuring enhanced durability compared to the thinner version. For optimal playability, it's recommended to reduce the tension on ALU Power by at least 10%. Either string can be used in the mains to maximize power and performance.