Rotefella BC Magnum binding. Manual Back Country Binding from Rottefella. Very stable and secure, delivers the torque you need to turn wide skis in deep snow. Reliable manual attachment ensures no icing problems in deeper snow. These are the heaviest duty NNN bindings made. Fits only with NNN-BC soled boots. These bindings are affixed to the skis by five screws per binding. Sold as a pair.