•   Crossbow      Crossbow strings and cables are made to      factory specifications using one of four      materials SYNERGY, 454X, Dynaflight 97      or B-500. •   SYNERGY String Material      Is a unique blend of SK78 fiber. This proprietary      blend of fiber was developed to decrease creep      while increasing durability. Combining the      toughest most reliable material in the industry      with FirstStringTM’s unique manufacturing      process and complimentary materials gives you      the reliability you have come to expect from      FirstStringTM. •   B-500 String Material      B-500 Dacron is a Polyester material usually      used for older recurve bows or on those      compounds that have steel cable systems. •   BCY 452X String Material      452X is a Vectran/Dyneema® blended material.      Used on modern recurve bows and modern      compound bows. The archer’s first choice in      minimizing string movement. •   DF97 String Material      DF97 is a pure Dyneema® material. Used on      modern recurve bows and more modern      compound bows. The archers’ first choice in      maximizing speed.