Rotefella NIS-NNN Xcelerator Skate 2.0 Binding. This is the racer’s choice binding! This lightweight racing binding is lighter, more durable, and a more secure fit than the Performance Skate. Fits all NNN-compatible boots (including Prolink and Turnamic). These bindings only affix to skis with an NIS plate (Nordic Integrated System)(not included). Binding are able to be fine-tuned by adjusting the binding (w/ a simple key included) forward for more control, or backward for more glide. Dual flexor system provides amazing control and balance of ski tip. Wide platform for stability and control. 175g per pair. Sold as a pair.