Designed to deliver unmatched Power under Control, the specially engineered HEAD Primal Hybrid String is built for players who want to raise their game without sacrificing any touch and feel. LENGTH: Main 6.1 m / 20 ft - Cross 6.1 m / 20 ft GAUGE: Main 1.30 mm / 16g - Cross 1.30 mm / 16g COLOR: Dark grey / Black Head Tennis String 281017