The Ashaway PowerKill 17 string offers Zyex® filaments to provide advanced racketball players with excellent tension stability and explosive power. This multifilament string with a gauge of 17 (1.25mm) gives you a blend of superior feel and control and boasts Power Filament Technology™ (PFT™) which makes it suitable for power players and chronic string breakers. It comes as a 12m (40ft) set.