Fit Flight signature push on System. Will only work with Fit Flight shafts. Fit Flight Pro introduces all new shapes Fit Flight Pro consists of 3 basic types TYPE-S TYPE-D and TYPE-V. Each type has 6 sizes for a total number of 18 models. With the wide range of shapes and sizes dart players can fine tune their setup to perfectly match their throw. 3D Designed - Flexible and Sturdy Introducing a new grid-like framework and overall durability improvements by three different thicknesses. The thickest portion runs along the edge. The added thickness around the sides and at the shaft socket strengthens the flight and will decrease tears along its length. By combining a medium thickness with the thinnest portion of the flight it creates the inner lattice work. This combination works to disperse external pressure. This decentralization of the external pressure has an effect not only on durability but also on shape retention which will greatly extend the usable life of the flight. Rattle Increasing the dimensional accuracy of the shaft socket reduces clatter on throws. No Friction The shaft insertion point is extended all the way to the end of the flight. This removes the mid-flight hump and will further decrease deflections and help increase grouping percentage. Push on fit Uses Fit Flight signature push on System. Will only work with Fit Flight shafts. Sold in a set of 3