Generally, the smaller the flight, your dart will fly faster and have a straighter trajectory (less arc) to the board.  Using a larger flight should arc your dart and slow it down.  There is no one set answer for the size of flight a person should use.  Unfortunately it is through trial and error that you may find the right flight shape for you.

 Flight Materials

Pentathlon and Ruthless flights are most popular because they are considered double thick and are usually easy to insert into a shaft.  Nylon flights are long lasting, but there are not a large variety available and tend to be hard to put into an aluminum shaft.  Poly, dimplex and glitter flights are a light to medium thickness.   

All Flights Sold in a set of 3 for $2.00