●Precision molded grippy stem help to reduce dart "slip"and thereby increase scoring oportunities. ●Built-in carbon rod to strengthen the screw thread,keep away from the screws broken,make fligths durable use. ●Built-in spring to tighten the shaft to barrel,avoid screw loosen in dart games. ●Cross Sword inserted to tighten the flight on the shaft,make them as an integrated one. ●Size:Measured from the edge of the screw to the joint between the flight and shaft. Length : A-21.5mm/B-25.5mm/D-31.5mm/E-35.5mm/F-40mm