Wilson's Duo Power Roland Garros pairs NXT Power with the all-new ALU Power Roland Garros for ultimate power on the famous red clay. Coated in the signature red clay colors of the French Open, the soft, explosive nature of the NXT (16/1.30) complements the top-notch blend of control, spin and durability of the ALU Power (17/1.25). The ALU Power strings used in this set contain a slightly thicker diameter, making them a more durable option than the thinner version. For ideal playability, reduce tension on ALU Power at least 10%. Either string can be installed in the mains for superior power and performance.