The ROST T19 Integrated Flights from CUESOUL is made of special material between hard and soft. The Cuesoul AK5 integrated shaft/flight system is made of material that is neither hard nor soft. Because Cuesoul uses this material, the flights do not tear as quickly as others. They now have a new model T19 AK57= the shaft has been made stronger than the AK5 series, with a slightly stronger core. The flights are made at exactly 90 degrees for a perfect flight and a more precise direction for your dart game.