Sizes of shafts are not just for the preference of the user. Shafts come in many lengths for a purpose, and that purpose depends on how the dart is thrown. A Softer toss generally requires a longer shaft and a larger sized flight. Conversely, the harder a dart is thrown, the shorter the shaft and smaller the flight should be. When using an aluminum shaft, o-rings are strongly suggested. Search ASIN B0051HT936 to pick up a pack with your order. Aluminum Dart Shafts Additional Details ------------------------------ Package quantity: 1