The "flappy" bit at the end of your dart is actually a sophisticated aero-dynamic stabilizer. The shape you choose drastically changes how the dart behaves in flight.
- Standard: Maximum lift. Keeps heavy darts fly straight.
- Pear/Slim: Less drag. Better for players with a very fast throw or lighter darts.
- Kite: A middle-ground between standard and slim. Very popular among technical players.