Wilson Enduro Tour String is a softer playing endurance polyester string with a blend of 28 polymers and additives. Enduro Tour's construction improves tension maintenance over traditional polyester strings. Previously only available to Wilson competition players. Wilson Enduro Tour 17 String offers better spin and more playability, but less durability compared to the 16 gauge version.Length: 40 feet / 12.2 mGauge: 17 / 1.25 mmColor: White