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. "Standard" shaped flights are designed to capture the most amount of air possible. This action stabilizes the flight pattern of a softly thrown dart with a lot of arc.

3 Flights Total 1 set of 3 Standard Dart Flights