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