The Gripper 360 Black Shafts from UNICORN are made of polycarbonate with aluminum spinning top. Thanks to the spinning top, you'll have fewer bouncers and your flights will last longer. Unicorn Gripper 360 shafts come in a set of three. 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.