The revolutionary Clic System is the ultimate ergonomic combination of design, form and function. packaged in a sleek 100mm x 45mm display pack. Simply push the flight onto the shaft, and the flight is securely located but free to rotate with perfect 90 degree wing angle.Features :Flight rotates if a following dart makes contactFlights will not come off during playMade from super tough state of the art materials17 degrees of longditudinal flex reduces deflectionsFlight and shaft weigh the same as the traditional system