Bulls NL Robson Plus Crystal Std No6 Blue Dart Flights. For use on most Nylon or Aluminium shafts – this new concept flight simply pushes onto your normal shaft to give you a solid professional setup. The durability of the flight is excellent. Each pack contains 3 flights. Bulls NL Robson Plus Crystal Std No6 Black Dart Flights. For use on most Nylon or Aluminium shafts – this new concept flight simply pushes onto your normal shaft to give you a solid professional setup. The durability of the flight is excellent. Each pack contains 3 flights. Bulls NL Robson Plus Crystal Std No6 Clear Dart Flights. For use on most Nylon or Aluminium shafts – this new concept flight simply pushes onto your normal shaft to give you a solid professional setup. The durability of the flight is excellent. Each pack contains 3 flights. Bulls NL Robson Plus Crystal Std No6 Pink Dart Flights. For use on most Nylon or Aluminium shafts – this new concept flight simply pushes onto your normal shaft to give you a solid professional setup. The durability of the flight is excellent. Each pack contains 3 flights.