An update to the NXT Duo, the Wilson NXT Duo II combines Luxilon Adrenaline 17g and Wilson NXT 16g strings. Luxilon Adrenaline is a polyester made from liquid crystalline. Adrenaline provides a crisp, firm feel that's great for the hard hitting players. Wilson NXT is one of the most popular multi-filament strings on the market. NXT has a nice soft feel, providing good ball pocketing. For durability and control, string with the Adrenaline on the mains. For a softer feel and more spin, string with NXT on the mains.