Firestorm is the string called our Line String, Featured as X-treme Power; this string is a favorite amongst ATP Players using Signum Pro; this string has impressive power, outstanding durability, excellent tension maintenance, and a feeling worth trying. We´ve had fantastic feedback from this string, so we think this is a must for any Tennis Enthusiast. • Length: 660ft/200m • Gauge: 17L(18)/1.20, 17/1.25mm, 16/1.30mm • Color: Gold • Construction: Monofilament • Advantage: Power, control and durability
