A combination of Luxilon Adrenaline 125 and NXT 16G, Wilson NXT Duo II is a great hybrid for those wanting comfort and feel in addition to great durability and control. Luxilon's Adrenaline offers spin potential as well as durability, while NXT adds arm-friendly playability. You can't go wrong with this popular hybrid. Construction: Liquid Chrystalline Polymer / Multifilament Micro Color: Silver / Natural Gauge: 16L (1.25mm) / 16G 1.30 Length: 21' / 21'