Madshus Xcelerator 2.0 Skate BindingsThe Rottefella Xcelerator 2. 0 Skate Binding's unique construction and low weight gives you more power and better speed, while the binding's low profile provides optimum control in the track. With the included NIS key, you can easily place the binding in the desired position and move it forward for better control or backward for more speed. Depicted on NIS binding plate not included. Binding System NNN NIS Skiing Style Skate Flex Dual Flexbit Bi