It is always good to buy 2 sets of the same dart flights. When you ruin a flight you can just pull 1 flight out of your new pack. This way you extend the life of your flights by 3 times and are not playing with mix-matched flights. "Slim" shaped flights are designed to cut through the air with the least amount of resistance. This action allows the dart to travel in a straight line for the player that throws a fast dart. 9 Total Flights 3 sets of 3 Slim Dart Flights