The Luxilon 4G 1.25mm 17 Gauge Tennis String is packed with playability. Used on the pro tour by Grigor Dimitrov and others, this string is tested and proven to have a higher comfort for a monofilament. The average lifespan of the Luxilon 4G has been extended by simply tweaking the molecular properties over the past two years. The Luxilon 4G delivers a better control without high tension loss.