A high-performance all-in-one flight & shaft system using a patented twist system . The K-flight system, which combines lightness, hardness and softness, is designed to be very lightweight. The shaft part is designed to be used when other darts are hit, reducing bounce out while reducing weight. By improving the injection molding process and using special materials, it is possible to maintain a 90-degree angle from the new condition until the end of the play life. By adding a slight thickness to the outer circumference of the flight, durability is dramatically improved.