This is the next generation in string making material. There is no creep and it is 20% stronger than Fast Flight. Fastest arrow speed. It is durable and stable. 100% HMPE. 1/4 lb. spool with a .015" diameter. Available in Red, Hunter Green, White, Bronze, Dark Brown, Medium Brown, Bright Yellow, or Black. Before you use high performance strings, check with the manufacturer of the bow. All Bingham Bow designs will work with Astro Flight, as long as appropriate tip overlays are used. Use high performance strings at your own risk. We cannot be held responsible for bow damage.