Golden Set Tennis Snake-Bite Max Spin Polyester Tennis String (Red, 17 Gauge Set (40ft/12.2m)) CONSTRUCTION: Co-polyester mono-filament with a twisted heptagonal cross-section Snake-Bite provides performance and durability equivalent to much more expensive polyesters like Babolat RPM Blast GAUGES: 16 (1.30mm), or 17 (1.25mm) AVAILABLE IN: Sets (40ft/12.2m) or Reels (660ft/200m, one reel is enough string for 18 racquets) Suitable for all levels of players from beginners to tour professionals