The Dunlop DNA 1.30mm tennis string set is 12m (39.4ft) long, which is enough to re-string one racket. The DNA is a premium multifilament string with a unique PBT fibre coil that spirals round the central core to provide added power & more durability without compromising on feel & comfort. This grey string also ensures an excellent comfort while playing & has a gauge of 16 (1.30mm).