Luxilon Duo Control 4G Rough 125 and NXT Control 16g Tennis String offers the control and tension maintenance of Luxilon 4G and the exceptional feel and comfort and and increased durability of Wilson's iconic NXT Control multi-filament in the same package. NXT Control is the firmest version of NXT on the market while 4G Rough re-set the bar for polyester tension maintenance.Colors: Gold / NaturalGauge: 125mm 16L / 1.30mm 16GLength: 20ft / 20ft