CUESOUL's Standard Integrated Flight Gradation 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. The shaft is also made flexible, making this combination nice to throw but also very durable. The flights are made at exactly 90 degrees for a perfect flight and a more precise direction for your darts game.