The Prism Force Shafts from WINMAU are made of strong polycarbonate and finished with black stripes at the bottom of the shaft. The Winmau Prism Force also contains an aluminum ring that sets the flight tight in the shaft. In short, good quality shafts for a good price. You can easily replace shafts with any dart. They are available in different sizes to customize your dart in length and feel. Sizes: XX-Short/Micro, X-Short, Short, In Between, Medium & Long. In addition, they also consist of different materials: nylon, carbon, plastic, metal, etc. In short, you can adjust your dart to your own taste and feeling through different types of shafts. The Prism Force Shafts from WINMAU have the following sizes: Short: 37mm, In Between: 41mm, Medium: 48mm.